Mechanical Ventilation per ASHRAE 62.2

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Permalink Reply by Sean Lintow Sr on February 29, 2012 at 3:46pm

Buy a larger one & use a timer - trust me when I say you do not want them running 24x7, especially in a humid enviroment

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Permalink Reply by David Meiland on February 29, 2012 at 6:26pm

Sean, help a cold-climate guy out here... what's the issue with humidity and 24/7 run-time?

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Permalink Reply by Sean Lintow Sr on February 29, 2012 at 7:53pm

The humidity inside rises to much & in small houses where the AC unit is oversized because we cant buy a small enough unit...

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Permalink Reply by Paul Raymer on March 1, 2012 at 10:32am

There are a couple of pretty nifty choices from Venmar.  The Kubix unit comes in either an HRV or ERV version.  It uses 60 watts, 77% Apparent Sensible Effectiveness (ASE).  It's like a 16" cube using 4" ducting.  A more energy efficient alternative is the EKO version.  The ERV version is 73% ASE.  It uses between 26 and 37 watts with flows up to 84 cfm.  It doesn't require a drain in the ERV version.

These are not ceiling mounted units like the Panasonic, but I think getting the supplies and exhausts separated is a better way to go if possible.

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Permalink Reply by George W. Reynolds on March 6, 2012 at 7:38am

I also work with Habitat and like yours, our houses have oversized units because of the extreme tightness, low UA numbers and limitations on ASHP systems.  We use a cycle timer and motorized damper for supply air ventilation. We are also considering ERV/HRV but before choosing and ERV I would have to ask if the manufacturer  can supply a certification that the latent energy (water) recovery does not include any VOC, airborne pathogens or aerosols from toilets. My request to Venmar got circled back to our sales rep who was unsure if such a certification was required.

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