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OPERATION OF SYSTEM
1.
After installation is complete it will be necessary to check and balance the airflows through each hood. The static
pressure for each hood is listed in the hood information table on the job specific submittal drawings. The specific
exhaust static pressure for each hood should be referenced for the airflow balance for that hood. The exhaust air
being drawn through the grease filters creates a negative static pressure behind the filters in the exhaust plenum.
This negative static pressure can be measured and has a direct relationship to the total exhaust airflow measured in
CFM (Cubic Feet per Minute). Halton Capture Jet hoods are calibrated based on the model of hood and the number
of grease filters the hood has. A static pressure curve is provided with each hood which allows the air balancer to
easily set up the exhaust fan to draw the correct exhaust CFM through the hood based on measuring the static
pressure of the exhaust plenum. On the Capture Jet
ports for measuring the negative static pressure drop through the filters and also the positive Capture Jet
pressure. These ports are located on the inside of the capture portion of the canopy on the exhaust and Capture Jet
plenums. The T.A.B. port for measuring exhaust static pressure is on the exhaust plenum side of the hood, near
the top inside panel and is found near one of the corners above the grease filters. The T.A.B. port for measuring the
Capture Jet® static pressure is found in the inner front of the hood, near the top inside panel and near one of the
corners of the inner face. There is a black plastic cap on each of the brass T.A.B. port fittings to keep them clean. The
cap should be removed for taking the static pressure measurements and then replaced when the measurements are
completed. The exhaust static pressure is measured using the negative connection on the manometer, leaving the
positive port of the manometer open to atmosphere. The Capture Jet
connection on the manometer, leaving the negative port of the manometer open to atmosphere. Adjustment to the
static pressure of the exhaust plenum is made by adjusting the speed of the exhaust fan. Adjustment to the Capture
Jet fan is made inside the inner front of the hood at the Capture Jet speed controller. See procedure below if Capture
Jet fan adjustment is necessary.
**It is very important that the fan for the Capture Jet
See the job specific information for required airflows. The Capture Jet fan is adjusted at the factory for proper airflow.
Check the static pressure of the Capture Jet plenum and adjust the Capture Jet fan speed only if the pressure
reading is different than the T.A.B. port pressure specified on the job specific submittal drawings (measured reading
outside of plus or minus 0.05" w.c.). Adjustments to the Capture Jet
supplied with the fan. This speed controller will be mounted inside the Capture Jet plenum; the adjustment control
knob can be accessed by removing the chrome button cover in the center of the Capture Jet fan access cover. The
speed controller is adjusted using a small flathead screwdriver, turning the control clockwise to decrease the speed
of the Capture Jet fan, and turning the control counterclockwise to increase the speed. Very small movements of
the control will result in appreciable static pressure changes to the Capture Jet plenum. Monitor the manometer
connected to the T.A.B. port of the Capture Jet plenum as adjustments are made. After each adjustment allow the
pressure to stabilize before adjusting further.
Capture Jet
®
with Water Wash Operation & Maintenance Manual
line of hoods, Halton supplies T.A.B. (Testing And Balancing)
®
static pressure is measured using the positive
®
air be balanced according to specifications.
®
fan can be made with the speed controller
®
13
plenum
®
®
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