Lifebreath CAF-02-MB Bedienungsanleitung PDF herunterladen (Seite 26)

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

(6"÷12)

]

÷4

= 0.2 square feet

The airflow is then:

640 ft./min.

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

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.

BUILT-IN

BALANCING

DAMPERS

BACK DRAFT

DAMPER

OUTSIDE

HOOD

INSULATED PIPE

WITH VAPOUR

BARRIER

Note: For best results keep Pitot tube

well away from dampers.

Pitot Tube

Figure A

Figure B

Figure C

Pitot Tube and Gauge

Placement of the Pitot Tube

Push and turn with slotted

screwdriver. Damper

automatically locks when

pressure is released.

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”

Insulated flexible

ducting

Balancing Collar Instructions

Figure D

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 43 44

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