What effect?
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07-19-10, 08:06 AM
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What effect?
I am installing 8" ducting thu-out and would like to reduce to
6" at the registers, what effect will it have on volume and cfm? This is for heat only and I am maxed out on number of registers and am borderline on recommended cfm.
6" at the registers, what effect will it have on volume and cfm? This is for heat only and I am maxed out on number of registers and am borderline on recommended cfm.
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07-19-10, 07:26 PM
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Register's 'Ak' is in sq.ft., times the measured velocity in FPM = CFM
Originally Posted by randm
1) I am installing 8" ducting thu-out and would like to reduce to 6" at the registers, what effect will it have on volume and cfm?
2) This is for heat only and I am maxed out on number of registers and am borderline on recommended cfm.
2) This is for heat only and I am maxed out on number of registers and am borderline on recommended cfm.
The reducer from 8" to 6" will increase the velocity with a small loss in delivered CFM.
Then you will need to select diffusers that will have the desired velocity, throw & delivered CFM.
Search Hart&Cooley & Lima for register info., the 'Ak' is the free air area of the register in sq.ft., times the "measured velocity" in FPM = CFM.
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