IR Series Brochure

ManualsBrandsFantech ManualsDampersIR Series 12" Duct Iris Damper

Airflow is found from the formula:

where ‘q’ is the airflow in cfm and p is the differential

essur

e in in.w

.g. found by connecting a manometer or other

pressure instrument to the two pressure taps provided on the

Iris Damper.

Alternatively, you may use the graph method to find airflow.

Each model in the Fantech Iris Damper series has its own

specific air

flow and sound characteristics graph.

q = K x p,

Features:

• Flow measurement accuracy +/- 5%

• Linear response flow control

• Nine sizes available from 4” to 25”

• Quiet, low self-generated noise

characteristic

• Compact design allows for

simple installation

• Each damper comes with

permanent pressure taps

• Airtight construction with integral

gaskets for duct connection

• Internal aperture opens fully to allow

duct cleaning without dismantling

• Five year warranty

Description and Function

The Fantech Iris Damper is the ideal device for measuring and

adjusting airflow through a duct. The design of the adjustable

aperture ensures low turbulence resulting in minimal

self-generated noise.

Adjusting airflow/pr

essur

e is a simple matter of positioning the

calibrated control lever on the outside of the Iris Damper.

Flow can be determined from the K factor and a differential

pressure measur

ement. Use the lever on the damper to select

the K factor.

Summary of content (4 pages)

PAGE 1
Features: • Flow measurement accuracy +/- 5% • Linear response flow control • Nine sizes available from 4” to 25” • Quiet, low self-generated noise characteristic • Compact design allows for simple installation • Each damper comes with permanent pressure taps • Airtight construction with integral gaskets for duct connection • Internal aperture opens fully to allow duct cleaning without dismantling • Five year warranty Description and Function The Fantech Iris Damper is the ideal device for measuring and ad
PAGE 2
IR6 - Calculation Example 1.6 1.4 Calculation example: The airflow (cfm) and sound pressure level can be found from the graph when the K factor and static pressure are known. If the Iris Damper is set to 260 (1) and the differential pressure between the two pressure taps is 0.8 in.WG (2), the airflow (q) is 232 cfm. (3) K=90 55dB(A) Static Pressure, Ps (inH2Og) Formula: Note that the formula: q = K x ∆p can be used to get the same result, 0.8 x 260 = 232 K=160 1.
PAGE 3
IR8 IR10 0.8 K=300 1 K=220 55dB(A) 55dB(A) K=300 0.9 0.7 K=500 K=400 50dB(A) K=600 50dB(A) K=800 0.5 45dB(A) K=1000 0.4 40dB(A) 0.3 35dB(A) K=1600 30dB(A) Static Pressure, Ps (inH2Og) Static Pressure, Ps (inH2Og) 0.8 0.6 K=700 0.7 45dB(A) 0.6 K=1000 0.5 40dB(A) K=1400 0.4 35dB(A) 0.3 K=2000 30dB(A) 0.2 0.2 K=3330 0.1 0.1 0 0 0 100 200 300 400 500 600 700 800 0 900 200 400 600 Flow Rate, Q (cfm) Flow Rate, Q (cfm) IR12 800 1000 1200 IR16 0.
PAGE 4
Dimensions MODEL IR4 IR5 IR6 IR8 IR10 IR12 IR16 IR20 IR25 UPC# 63040 63050 63060 63080 63100 63120 63160 63200 63250 Measurements A B C 4 6 1/2 2 1/4 5 8 1/4 2 1/2 6 9 2 8 11 1/4 2 1/4 10 13 2 3/4 12 16 2 3/8 16 22 3 1/4 19 3/4 25 3/8 2 3/8 24 3/4 32 2 3/8 A C All Dimensions are in inches A B Iris Dampers Typical multi-duct installation where Iris Dampers are used to balance the system.