Retrotec DucTester 340 Operation Manual
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Retrotec DucTester 340 Operation Manual

Residential ductester
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Residential DucTester
rev-2019-08-29
Operation Manual
Model 340x & 340 DucTester Systems
Retrotec

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Summary of Contents for Retrotec DucTester 340

  • Page 1 Residential DucTester rev-2019-08-29 Operation Manual Model 340x & 340 DucTester Systems Retrotec...
  • Page 2 1060 East Pole Road Everson, WA USA 98247 For support: Call 1 (888) 330-1345 in USA +1 (360) 738-9835 outside USA support@retrotec.com or Fax +1 (360) 647-7724 Manual for: Models 340x with DM32 and Model 340 with DM32 WiFi Page 2 of 89...

  • Page 3: Table Of Contents

    The information in this document is subject to change without notice. Retrotec reserves the right to make revisions to this publication without obligation to notify any person or entity of any such changes.
  • Page 4 Method #2: Set duct to house pressure to 0 Pa (using DucTester gauge) ..39 Duct Leakage to Outdoors with 1 gauge and 2 fans ..........41 Combined Total Duct Leakage and Duct Leakage to Outdoors Method ....43 Page 4 of 89 ©Retrotec 2017...
  • Page 5 Average Duct Operating Pressure ................. 54 10.8.5. Leakage Split ......................54 10.8.6. Supply Leakage Penalty ..................54 10.8.7. Return Leakage Penalty ..................55 10.9 Save the Duct Leakage Test Report as a PDF file ............ 55 Page 5 of 89 ©Retrotec 2017...
  • Page 6 Avoid common mistakes ................. 70 Create a Blower Door with a DucTester fan ..........72 16.1 Use a DucTester to test tight enclosures..............72 16.2 Blower Door systems for testing tight enclosures ..........72 Page 6 of 89 ©Retrotec 2017...
  • Page 7 Black and Decker Electromate 400 Model VEC026BD ............84 Appendix F: Duct-Test Recording Forms ............85 Total Duct Leakage Test Form Test date: _______________/20____ ..... 85 Total Duct Leakage Test Form (CA) Test date: _______________/20____ ....86 Glossary ......................88 Page 7 of 89 ©Retrotec 2017...

  • Page 8: Important Equipment-Related Safeguards

    DucTester: Important equipment-related safeguards When using electrical appliances, basic safety precautions should always be followed. If Retrotec equipment is used in a manner that does not follow the information provided in this manual, safety to the operator and equipment performance may be impaired.
  • Page 9 Air sealing work should not be undertaken until existing combustion safety problems are resolved, or unless air sealing is itself being used as a remedial action. Page 9 of 89 ©Retrotec 2017...

  • Page 10: Why Measure Duct Leakage

    The Duct Leakage Test Report software (in Excel) available from Retrotec can be used to estimate the energy loss from duct leakage, as described in section 10.8.

  • Page 11: How Much Duct Leakage Is Acceptable Under Existing Codes

    /100 sq ft Required: -Where ducts are located outside the conditioned space -In existing houses where more than 50% of the ducts are replaced Not Required: - If all ducts are located in the conditioned space Page 11 of 89 ©Retrotec 2017...
  • Page 12 NOT installed <= floor area (sq ft) X 0.04 CFM WA: USA + 25 Pa with air handler installed <= floor area (sq ft) X 0.08 CFM Duct Leakage to Outdoors (recommended where possible) <= floor area (sq ft) X 0.06 CFM Page 12 of 89 ©Retrotec 2017...
  • Page 13 Disclaimer: This information is not guaranteed. As Codes are being updated continually, this table represents the most up to date information available at the time of publishing. Please refer to “rev” date on cover page of this document to determine date of publishing. Page 13 of 89 ©Retrotec 2017...

  • Page 14: Model 300 / 400 System Types

    340 but still a fraction of the old fashioned Commercial duct testers in common use. This manual focuses on the Model 340x. Be sure to refer to the Quick Guide that came with your system or can be obtained at: http://retrotec.com 340x...

  • Page 15: Types Of Duct Leakage Tests

    Along with this problem, negative pressures can also cause increased moisture in the building, and possibly allow radon gas to infiltrate as well. Page 15 of 89 ©Retrotec 2017...
  • Page 16 This is a schematic of a duct leakage test. Registers are sealed, the duct tester fan is connected to a return and the pressure gauge picks up the pressure in the ducts. Locate the step by step Quick Guide that came with your equipment or access it at www.retrotec.com. Figure 1: DucTester setup, including tubing locations and necessary connections.

  • Page 17: Model 340 Ductesters

    The Retrotec DucTester does not require a flow conditioner because it uses a flow nozzle, which is intrinsically stable in either direction because the flow gets compressed as it goes through the nozzle.

  • Page 18: Range Configurations

    Figure 3: Open Range is for the leakiest ducts and houses while Ranges 74, 47, 29 are for progressively tighter ducts. All Retrotec calibrated fans have multiple Range Configurations in order to measure a wide range of air leakage flow rates. Select the correct Range Configuration by running the fan speed up to ensure it is running at over 50% speed and the gauge is giving a flow result.

  • Page 19: Retrotec Calibrated Fan: Model 300

    Any input voltage from 100 to 280 Volts AC, 50 to 60 Hz is acceptable. Speed is controlled using the knob on the 300 fan or the Retrotec digital gauge, which will control the fan to any desired Set Pressure or Set Speed.
  • Page 20 Figure 6: Self-referencing pressure pickup. Page 20 of 89 ©Retrotec 2017...

  • Page 21: Digital Gauge

    The latest Retrotec Digital Gauge is included with all Retrotec DucTester systems. The gauge can be combined with the Model 300 fan for automatic control to Set Pressure or Set Speed. The gauge is a dual-channel manometer, which can automatically convert the measured Fan Pressure into a range of useful results that meet every major testing standard in the world.

  • Page 22: Additional Included Duct Testing Components

    Additional included duct testing components In addition to the calibrated fan and digital dual-channel pressure gauge, a Retrotec DucTester system includes a few additional items. 5.4.1. Grill Mask for sealing registers Grill Mask is used to seal over registers and vents. Grill Mask comes in a 12" wide roll.

  • Page 23: Power Cord

    A battery charger is included to charge the DM32 gauge’s batteries. For instructions on charging the DM32 batteries refer to the DM32 Manual. 5.4.8. Additional parts and accessories for the DucTester For options and accessories look at: retrotec.com For more information on these parts, contact sales@retrotec.com Page 23 of 89...

  • Page 24: Prepare For The Duct Leakage Test

    The Quick Guide is intended to walk you through the test Step by Step. Check it off as you go. Use this manual for additional guidance. You can also watch the videos on the Retrotec website and take the on- line training course.
  • Page 25 Page 25 of 89 ©Retrotec 2017...

  • Page 26: Seal All Supply Registers

    Preparing for a duct leakage test requires preparing both the duct system and the building. The following setup procedures are recommended by Retrotec. If the test is being conducted according to a specific program guideline, you may be required to set up the duct system and building differently than what is described below.

  • Page 27: Make All Connections On The Gauge And Fan

    Figure 14: Electrical connections on the bottom of the gauge include Network (Ethernet) Cable that goes from the DM32 to a PC (if Retrotec PC software is used for data collection), micro USB cable for PC software and/or charging, and a reset button.

  • Page 28: Blue Tube Location Matters When Testing Leaky Ducts

    Figure 17: A Static Pressure Probe attached to a pressure tube allows the DucTester is normally attached, will show the lowest possible measurement of pressure without flow leakage results. interference (e.g.: inside a supply register) Page 28 of 89 ©Retrotec 2017...

  • Page 29: Connect The Flex Duct To The Duct System

    10. Place the DucTester in such a position as to minimize any major bends in the Flex Duct. Figure 19: Flange taped onto a Figure 18: Flex Duct connected to the Flange. return register before attaching the Flex Duct Page 29 of 89 ©Retrotec 2017...

  • Page 30: Or Connect To The Air Handler Cabinet

    12.3. Higher air flow rates can also be measured when connected to the air handler itself because then the exclusive @Pressure feature on the Retrotec gauge can be used to establish an exact flow rate at any required pressure.
  • Page 31 If you get more than 3 CFM you might start to worry about it. Range 7 is available on the Model 340 but this test should show you don't need it. Page 31 of 89 ©Retrotec 2017...

  • Page 32: Install Range Configuration On Fan

    Grill Mask (or other sealing means) onto the registers ensuring a tighter seal. In the absence of any other requirement, Retrotec recommends depressurization. Some standards require pressurization.

  • Page 33: Blow Air Out Of The Ducts For Pressurization

    The only advantage of pressurizing is that it makes changing Range Rings on the fan easier. If a pressurization test is needed, simply install the Flex Duct on the outlet side of the fan. Figure 23: Install Flex Duct over the fan exhaust, for pressurization. Tighten the strap. Page 33 of 89 ©Retrotec 2017...

  • Page 34: Set Up The Gauge To Display Duct Leakage Results

    Grey areas in the table indicate those results are not needed for those programs but can be turned on or off any time they may be needed. The “@ Pressure” value for Flow measurement is set at the value required for duct testing. Page 34 of 89 ©Retrotec 2017...

  • Page 35: Mode Setup For Various Standards Around The World

    Pressure (Channel A) displays close to 25 Pa. Press until “@ is ON” is displayed to view the result estimated at 25 Pa. If your standard requires 50 Pa, change the [Default @ Pressure] to 50 Pa from the [Settings] menu. Page 35 of 89 ©Retrotec 2017...
  • Page 36 50 Pa, change the [Default @ Pressure] to 50 Pa from the [Settings] menu. 7. If "--" appears as the flow result, or the desired test pressure cannot be reached, change the Range Configuration on the fan and on the gauge to match (see section 6.8). Page 36 of 89 ©Retrotec 2017...

  • Page 37: Conduct The Duct Leakage Test

    Pressurization, the positive pressure in the ducts tends to push the seals off the registers. The test diagrams display testing at 25 Pa. For results at 50 Pa, substitute “50” wherever “25” appears. Figure 25: Total Duct Leakage under depressurization - DucTester and tubing setup. Page 37 of 89 ©Retrotec 2017...

  • Page 38: Duct Leakage To Outdoors With 2 Gauges And 2 Fans

    If a green, self-referencing, pressure port is available on the Blower Door fan, use the green pressure tube to connect it to the Blower Door gauge, and ensure the Device chosen on the gauge is “Retrotec 3000SR”.

  • Page 39: Method #2: Set Duct To House Pressure To 0 Pa (Using Ductester Gauge)

    If your standard requires 50 Pa, substitute 50 for 25 in all instructions. 17. Complete the previous Total Duct Leakage test. 18. Ensure all doors and windows are still closed and exhaust fans are still off. Page 39 of 89 ©Retrotec 2017...
  • Page 40 23. When 0 Pa +/– 1 is achieved on the DucTester gauge, record “Flow” from the DucTester gauge, which is Duct Leakage to Outdoors. Figure 31: Method #2 Duct Leakage to Outdoors, under pressurization Page 40 of 89 ©Retrotec 2017...

  • Page 41: Duct Leakage To Outdoors With 1 Gauge And 2 Fans

    -25 Pa appears for Duct Pressure (Channel A) of the gauge. 30. With the Blower Door still running, connect the blue tube to the gauge and re-adjust the DucTester speed to again set the duct pressure to -25 Pa. Page 41 of 89 ©Retrotec 2017...
  • Page 42 Figure 35: 1 Gauge Duct Leakage to Outdoors under pressurization, setting the building pressure 32. Ensure that the Device is 340 and the correct DucTester Range is selected on the gauge. Page 42 of 89 ©Retrotec 2017...

  • Page 43: Combined Total Duct Leakage And Duct Leakage To Outdoors Method

    8. Set the Blower Door gauge to 0 Pa by pressing [Set Pressure] [0] [Set] on the Blower Door gauge. 9. When 0 Pa +/– 1 is achieved on the Blower Door gauge, record the result from “Flow” on the DucTester gauge which is Duct Leakage to Outdoors. Page 43 of 89 ©Retrotec 2017...

  • Page 44: If No Results Are Displayed

    25 Pa or 50 Pa on Channel A. If the flow still reads “--” then the yellow or green tubes could be blocked or disconnected. Page 44 of 89 ©Retrotec 2017...

  • Page 45: Cannot Achieve Test Pressure

    Registers with high velocity smoke movement are a good indication of a potential disconnect behind that register. Fixing the disconnect in the ducts may reduce the leakage enough to continue testing the duct system. Page 45 of 89 ©Retrotec 2017...

  • Page 46: Restore The House To Pre-Test Conditions After Testing Is Complete

    4. Ensure any combustible appliances that were turned off are turned back on, and that they are properly vented again. 5. Unseal any closed ventilation, or reconnect the ducts if it was disconnected. 6. Close any exterior doors or windows that were opened during total duct leakage test. Page 46 of 89 ©Retrotec 2017...

  • Page 47: Create A Duct Leakage Test Report With Potential Energy Savings

    10. Create a Duct Leakage Test Report with Potential Energy Savings The Retrotec Duct Leakage Test Reporting software was developed so users have a way to automatically create professional reports that display duct leakage results as well as potential energy savings. Reports...

  • Page 48: Get The Excel Spreadsheet Based Software To Run On Your System

    Duct Leakage Test Report software you have, there may be a warning you have to bypass, before enabling macros. You may see the following “Protected View” warning (red bar): If so, click on it, and you will see the following Protected View option: Page 48 of 89 ©Retrotec 2017...

  • Page 49: Showing/Hiding The Ribbon

    “Conditioned Flow Area”: square feet, or sq ft “Leakage Area”: square inches, or sq in 10.2.2. Metric units “Flow” and “Duct Leakage”: cubic metres per hour, or m “Conditioned Flow Area”: square meters, or m Page 49 of 89 ©Retrotec 2017...

  • Page 50: Choose Duct Test Type

    Likewise, if the area is not air-conditioned or heated, it is not considered to be part of the Conditioned Floor Area. The area entered is used to calculate the result for “Flow/Area” that will be displayed on the report. The Duct Leakage Test Report calls this result the “Leakage/Conditioned Floor Area”. Page 50 of 89 ©Retrotec 2017...

  • Page 51: Air Handler Flow

    The function on the gauge (from [Settings allows for this measurement to be taken. For more information, refer to Retrotec’s DM32 Operation manual. 10.6.4. Enter whether pressurizing or depressurizing (Test direction) Click to select whether the DucTester fan is setup to depressurize or pressurize the duct system (see section 6.9).

  • Page 52: Enter Flow Directly" Selection Or Range Configuration Selection

    Leakage Data that appears on the generated report as a result of that selection. The inputs highlighted in red are what would be copied from the gauge. “(Enter Flow directly)” selection: Range Configuration selection: Page 52 of 89 ©Retrotec 2017...

  • Page 53: Convert "Flow/Area" Data So It Can Be Entered Into Spreadsheet

    Annual Cooling Loss and Annual Heating Loss (i.e., potential energy losses due to duct leakage) can be reported. These inputs are optional. If nothing is entered into this section, the “Cost of Duct Leakage” section of the report will not appear in the output. Page 53 of 89 ©Retrotec 2017...

  • Page 54: Of Duct Leakage To Outdoors

    For example, if supply leaks are going into a wall cavity, some of the energy will be go back into the house, so a lower leakage penalty would provide a better estimate of annual HVAC losses. Page 54 of 89 ©Retrotec 2017...

  • Page 55: Return Leakage Penalty

    Click "File" → "Save As" → Change the "Save as type" to "PDF " Select the directory to save the PDF file to → Enter a proper file name for the PDF file to as Click "Save" Page 55 of 89 ©Retrotec 2017...

  • Page 56: Find Air Leaks In The Ducts

    Smoke puffers work similarly to theatrical smoke for finding leaks, but on a much smaller scale. The chemical smoke of Retrotec’s Air Current Tester is the same density as air, and therefore does not move unless there is air movement. Puff out a small amount of smoke near suspected leaks, (for example, near joints, or in front of registers), while the DucTester is connected to the ducts and running, and notice the smoke either being blown away or being sucked in, depending on the direction of the test.
  • Page 57 Part number Large 24.5 x 24.5 x 8.75 PP101 Small 13 x 15 x 4.5 PP102 For more information about conducting a Pressure Pan test, see the Retrotec Residential Pressure & Air Leakage Testing Manual. Page 57 of 89 ©Retrotec 2017...

  • Page 58: Measure The Air Handler System Flow

    Measure with a DucTester as a powered flow hood on the return The Retrotec DucTester and Flow Hood can be used to measure air flows through supply registers, exhaust fans and other airflow devices, without affecting their flow rate, by neutralizing the pressure that would create a resistance to flow.

  • Page 59: Measure Air Handler Flow Using A Blower Door

    Use the “@” feature which will extrapolate your readings to the exact pressure previously recorded in the supply plenum. Page 59 of 89 ©Retrotec 2017...
  • Page 60 (hopefully minor) through the return ductwork. If this leakage is major, then obviously it must be fixed which will then yield a higher air flow measurement. Figure 42 Supply plenum pressure matching method Page 60 of 89 ©Retrotec 2017...

  • Page 61: Set Pressure In Front Of Return Register To Zero Method Or Using Your Blower Door As A Powered Flow Hood

    Page 61 of 89 ©Retrotec 2017...

  • Page 62: Measure Large Exhaust And Intake Flow Rates

    Maximum flow out of tent 2 feet 750 CFM 1500 CFM 3 feet 1500 CFM 3000 CFM 4 feet 3000 CFM 6000 CFM 6 feet 6000 CFM 12000 CFM Larger tents generally work better because velocities are lower. Page 62 of 89 ©Retrotec 2017...

  • Page 63: Measure With A Ductester On The Air Handler Cabinet

    12.7 Measure with a gauge and a flow grid A unique Retrotec feature allows the gauge to be used with flow grids from other manufacturers. Measure the supply plenum pressure using the Static Pressure Probe supplied with each DucTester. Put the end of the blue tube with the probe into the supply plenum, connect the other end of the blue tube to the “Input A”...

  • Page 64: Measure Using Hole Flow On The Gauge

    Box pressure of 8 Pa or less are recommended because higher pressures mean the air handler is increasingly blocked and the test method itself is affecting the performance. On the Retrotec gauge, set the device to “Hole Flow”. Enter the area of the hole into the gauge using [Area] key, ensuring that the units you use for area match what the gauge is expecting for area.

  • Page 65: Estimate Hvac System Energy Loss From Ducts

    Operating Pressure. Table 6: CFM25 multipliers for average operating pressures. Multiplier for CFM25 = (Avg. Operating Pressure/25)0.60 Average Operating Multiplier for Pressure (Pa) CFM25 0.38 0.58 0.74 0.87 1.00 1.12 1.22 1.33 1.42 1.52 Page 65 of 89 ©Retrotec 2017...
  • Page 66 SPM is Supply Pressure Multiplier (default 1.0) Supply Loss Factor = 0.5 * 1.0 * 1.0 = 0.5 Return Loss Factor = (RLS x RLP x RPM) Where: RLS is Return Leakage Split (default 0.5) Page 66 of 89 ©Retrotec 2017...
  • Page 67 200 CFM. Assume the average operating pressure for the return side is closer to 35 Pa because it is close to the plenum takeoff. multiplier for return = 1.22 multiplier for supply = 1.0 (default) Page 67 of 89 ©Retrotec 2017...
  • Page 68 Annual heating loss = 20% x $ 500 = $100 Annual capacity loss = 20% x 3 ton = 0.6 tons Annual operating SEER = (1 – 20%) x 11 SEER = 8.8 SEER Page 68 of 89 ©Retrotec 2017...

  • Page 69: Field Check The Ductester To Find Out What Is Not Working

    4" x 4 5/8" square hole (18.6 sq in) cut in the center. If making your own, a 1/4 inch diameter hole should be made in one corner of the plate, as far away from the larger hole as possible, into which the blue tube can be inserted. Page 69 of 89 ©Retrotec 2017...

  • Page 70: Avoid Common Mistakes

    Range Configuration. One way to verify that the test is Page 70 of 89 ©Retrotec 2017...
  • Page 71 Press [@] to remove “@” from under the result. This method relies on the DucTester gauge measuring the pressure between the house and ducts which is set to zero by the DucTester but the extrapolation to zero that is attempted by the gauge will not work. Page 71 of 89 ©Retrotec 2017...

  • Page 72: Create A Blower Door With A Ductester Fan

    The Speed Control Cable can be plugged into either one of the two Control ports. To measure building envelope leakage with Blower Door testing, please refer to procedures outlined in Retrotec’s Manual-Door Fan Operation and QuickGuide-Blower Door. 15.2 Blower Door systems for testing tight enclosures Page 72 of 89 ©Retrotec 2017...

  • Page 73: Retrotec

    53 - 97 in (135 - 246 cm) Frame thickness 1.75 in (5.3 cm) Frame case 53 x 10 x 4 in (134 x 25 x 10 cm) Frame weight 19 lbs (8.6 kg) Page 73 of 89 ©Retrotec 2017...

  • Page 74: Appendix A: Calculate Air Flow Based On Channel B Fan Pressure Readings

    1.1920 0.036 Model These Ranges are optional for Model 340 0.5000 0.4420 -0.010 0.036 0.5300 0.1464 -0.070 0.18 0.4450 0.0810 0.10 0.00002 0.4450 0.01812 0.10 0.000007 0.4450 0.00417 0.10 0.000003 0.4450 0.00104 0.10 0.000001 Page 74 of 89 ©Retrotec 2017...

  • Page 75: Appendix B: Flow Conversion Tables

    Flow Conversion Table for Duct Test Pressure of 25 Pa Table 9: Flow in CFM for various fan pressures, Retrotec Model 300 Fans, Duct Test Pressure: 25 Pa (relative to outdoors) Flow AWAY or TOWARDS operator, both green and yellow tubes connected.

  • Page 76: Appendix C: Calculate Flow If Required Test Pressure Cannot Be Reached

    The n value is saved in the gauge. Set it to 0.65 for houses, and 0.60 for ductwork. Set to 0.5 for tests on the Retrotec house simulator, while measuring air handler flow and for any large hole that is not composed of long thin cracks.

  • Page 77: Extrapolation Error For Flow If Gauge "N" Doesn't Match Actual N

    0.0% 3.5% 7.2% 11.0% -5.0% -2.5% 0.0% 2.6% 5.2% 8.0% -3.5% -1.8% 0.0% 1.8% 3.6% 5.5% -2.2% -1.1% 0.0% 1.1% 2.3% 3.4% -1.0% -0.5% 0.0% 0.5% 1.1% 1.6% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Page 77 of 89 ©Retrotec 2017...

  • Page 78: Cannot Reach 25 Pa Factors

    600 CFM × 1.18 = 708 CFM Thus the estimated result for CFM at 25 Pa will be 708 CFM. The factors depend on the n value chosen. Table 11 is for n of 0.60 which is typical for ducts. Page 78 of 89 ©Retrotec 2017...

  • Page 79: Cannot Reach 50 Pa Factors

    Table 12: Factors for when a duct pressure of 50 Pa cannot be reached (assumed “n” value of 0.60). Pressure Cannot reach Pressure Cannot reach achieved 50 factor achieved 50 factor 1.00 1.52 1.01 1.55 Page 79 of 89 ©Retrotec 2017...
  • Page 80 1.08 1.79 1.09 1.85 1.11 1.91 1.13 1.98 1.14 2.06 1.16 2.15 1.18 2.24 1.20 2.35 1.22 2.48 1.24 2.63 1.26 2.80 1.28 3.00 1.31 3.25 1.33 3.57 1.36 3.98 1.39 1.42 1.45 1.48 Page 80 of 89 ©Retrotec 2017...

  • Page 81: Appendix D: Troubleshooting

    Occasionally simple problems do occur with a DucTester system. If the problem is described in any of the following sections, follow the steps to attempt to resolve the problem. If the problem persists, contact support@retrotec.com. “--” appears on display: Backpressure refers to the pressure that the DucTester fan works against while running. Under most testing conditions, backpressure is not a concern.

  • Page 82: Adjusting The Fan Inlet Nozzle If Is Rubbing Or Debris Needs To Be Removed From Fan

    Tape replacement method shown above. Using the roll of special tape supplied, start underneath the nozzle inlet, wrap tape around and finish by smoothing down as shown below. Page 82 of 89 ©Retrotec 2017...

  • Page 83: Appendix E: Using A Generator For Power

    Appendix E: Using a generator for power Retrotec recommends a generator with inverter type AC power output. Size the generator capacity above the maximum power required in order to reduce distortion of the AC power waveform. The higher the rated power output, the better. Suggestions for minimum generator output sizes are 3000W for Blower Doors and 500W for DucTesters.

  • Page 84: Generators

    3000W for even the most powerful Retrotec equipment. Portable Power Supplies Portable power supplies can provide enough power for Retrotec DucTester fans, but are unlikely to produce sufficient power for a Blower Door. Please ensure that the power supply meets the minimum power requirements of the fan before attempting to use one.

  • Page 85: Appendix F: Duct-Test Recording Forms

    __Rough in Air handler installed: 6 CFM/100 sq ft __Rough in Air handler not installed: 4 CFM/100 sq ft Return home to state you found it in Remove tape, turn HVAC equipment back ON Recording form based on IECC 2009 Page 85 of 89 ©Retrotec 2017...

  • Page 86: Total Duct Leakage Test Form (Ca) Test Date

    ____ CFM, ___ Pass, ___ Fail. page) is: Remove tape Remove tape from registers. Turn HVAC equipment back ON Re-install the furnace filter and turn all HVAC equipment back ON Recording form based on CA Title 24 Page 86 of 89 ©Retrotec 2017...
  • Page 87 Measure the fan flow divided by 100 X 15. Measured fan flow ______ / 100 X 15 = ____CFM E.g. an air-handler blower flow of 2000 CFM must have less than 2000 / 100 X 15 = 300 CFM of leakage. Page 87 of 89 ©Retrotec 2017...

  • Page 88: Glossary

    Baseline Pressure in other documents/standards used in the industry.) Blower The Retrotec fan unit that induces air flow and provides a Fan Pressure signal from which flow is measured. Units: Cubic feet per minute (the units of volumetric flow)
  • Page 89 The dial that is on a Fan Top to control fan speed Knob Open Range A Range configuration on a Retrotec Blower Door that has no Range Rings or Range Plates attached. It is sometimes referred to as Open (22) Range since it’s diameter is 22 inches. outdoors Outside the building in the area around the building.

This manual is also suitable for:

Ductester 340xDuctester 450xDuctester 300Ductester 440x

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