Pitot Tube and Gauge

DUCT

AIR

FLOW

Pitot tube

Magnehelic gauge

Figure A

This is an example for determining the airflow in a 6" duct. The Pitot tube reading was 0.025 inches of water. From the chart, this is 640 feet per minute.

The 6" duct has a cross sectional area of:

=[3.14 x (6"÷12)2]÷4

=0.2 square feet

The airflow is then:

640 ft./min. x 0.2 square feet = 128 cfm

For your convenience, the cross sectional area of some common round duct is listed below: DUCT DIAM. (inches) CROSS SECTION AREA (sq. ft.)

	5.0	.14
	6.0	.20
	7.0	.27
		INSULATED PIPE
		WITH VAPOUR
	BUILT-IN	BARRIER
	BUILT-IN
	BALANCING	OUTSIDE
	DAMPERS	OUTSIDE
	DAMPERS	HOOD
		HOOD
		BACK DRAFT
		DAMPER
		Figure C

Placement of the Pitot Tube

Pitot Tube

Note: For best results keep Pitot tube

well away from dampers.

Figure B

The accuracy of the airflow reading will be affected by how close to any elbows or bends the readings are taken. Accuracy can be increased by taking an average of multiple readings as outlined in the literature supplied with the Pitot tube.

Balancing Collar Instructions

Push and turn with slotted screwdriver. Damper automatically locks when pressure is released.

Insulated flexible

ducting

When connecting ductwork to the collar, take note where screws are located. Screws should be located no further than 1/2” from outside edge of collar, so as not to impede operation of the damper.

1/2”

Figure D

40DHWDF(T), 4TONVENTAC, 60VENTAC, 40VENTAC, 60DHWH(T) specifications

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