General Requirements - Mr. Heater MHT 45 Operating Instructions And Owner's Manual

Gas-fired, low-intensity infrared heaters

Hide thumbs

Table Of Contents

Table of Contents

MINIMUM HEIGHT FROM ROOF

TO LOWEST DISCHARGE OpENING

Roof pitch

Flat

to 6/12

Over 6/12 to 8/12

Over 8/12 to 10/12

Over 10/12 to 12/12

Over 12/12 to 16/12

Over 16/12 to 20/12

2. All other gas vents shall terminate not less than 2 feet (0.6m)

above the highest point where they pass through the roof and at

least 2 feet (0.6m) higher than any portion of a building located

within 10 feet (3.1m) as shown in the following illustration.

10ft. or less

Vent Cap

Type B

Vent Pipe

Type B

(Double Wall)

Storm Collar

Boot Flashing

2" Clearance

Seal joint &

annular space.

Vent Pipe

(Single Wall)

c) Horizontal Through the Sidewall

This heater, when horizontally vented, must be installed with the

approved venting system.

When venting the heater horizontally through a combustible

outside wall, the same requirements listed previously for Venting

Through the Roof apply except as follows:

1. When venting the heater to the outside of the building through

a sidewall, use 3 inch O.D. single-wall metal pipe. This is to

be constructed of galvanized sheet metal or other approved

noncombustible, corrosion-resistant material as indicated by state

and/or local codes.

2. For horizontal venting, the vent lengths may be as follows:

Minimum Equivalent Length = 5 feet of Pipe

Maximum Equivalent Length = 25 feet of Pipe

Use the following correction factors to obtain the equivalent

length:

a) Subtract 15 feet if the run is horizontal

b) Subtract 10 feet for an approved vent cap.

c) Subtract 10 feet for each elbow beyond 15 feet from the heater.

d) Subtract 15 feet for each elbow within 15 feet of the heater.

Mr. Heater | Gas-Fired Low-Intensity Infrared Heater

H (Min)

1.0 Feet

1.5 Feet

2.5 Feet

4.0 Feet

6.0 Feet

7.5 Feet

2ft. min.

NOTE: To minimize problems associated with

condensation in long runs, vent pipe can be

insulated.

3. The horizontal venting system approved with this heater consists

of the Side Wall Vent Kit (02840) shown are page 3.

4. Limit the quantity of 90° elbows to two. When vent pipe is in a

horizontal run, it must be pitched downward ¼ inch per foot

towards the vent terminal. The heater must be installed level.

5. The horizontal venting system shall not terminate:

a) Less than 4 feet (1.2m) below, 4 feet (1.2m) horizontally from,

or 1 foot (30cm) above any door, window or gravity air inlet into

any building. The bottom of the vent terminal shall be located

at least 7 feet (2.1m) above grade or above snow accumulation

levels as determined by local codes.

b) Less than 3 feet (0.9m) from a combustion air inlet.

c) Less than 3 feet (0.9m) from any other building opening or any

gas service regulator.

d) Directly over areas where condensate or vapor could create a

nuisance or hazard or be harmful to the operation of gas utility

meters, regulators, relief valves, or other equipment. Building

materials should be protected from flue gases and condensate.

6. In regions of the country where prevailing winds are consistently

higher than 40 mph, it may be necessary to terminate the vent

system above the roof level.

Vent Cap

18"

Venting/Ducting

For Commercial and Industrial Installations

Only