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Old 09-28-2012, 06:56 PM   #1
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Damper for HRV ducting

My Venmark EKOS 1.5 HRV has exhaust in 3 bathrooms and the kitchen. Between the 4 vents 150 cfm on high, 80 on low. I would like to add dampers to close the exhaust vent for 1 bathroom and the kitchen when the 20/40/60 timer in a bathroom is bumping the HRV into high.

I want to improve the exhaust flow in the two bathrooms with showers (no ceiling fans). They both have 5" ducts off of a 6" main. The dampers would go right after the takeoffs for the bathrooms for maximum effectiveness. By adding the dampers I would hope to increase the bathroom cfm from the current 35 or so to the low 70s. Bathrooms are small and only need 50 cfm.

Installing the dampers is simple enough, but I don't know what kind of control board/relay is needed to take the signal from the 20/40/60 timer to apply power to the dampers. Any suggestions on damper brands and a control mechanism?


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Old 09-28-2012, 08:25 PM   #2
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Damper for HRV ducting

24 volt power close dampers. Use a 120 to 24 volt transformer. And connect it so that the timer powers it. that way the dampers close when you use those bathrooms.

It may be easier to just run a larger duct to those bathrooms. 1-6" isn't large enough to carry the air of 2-5".


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