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I am doing a design on a house with a 38MBH input Twilight See-thru fireplace to the outside (http://www.fireplaces.com/downloads/brochures/HNG_TWILIGHTII_BRO.PDF). My question is how much of that load should I figure is going through to the inside and how much is going to the outside? Will...

We have been using HAP for a few years now. Recently we switched to TRACE. We are finding that it's much better than HAP for our purposes.

We are currently working on 3 projects were we are specifying BKM products (www.reverse-flow.com) They are upwards of 80% effective in heat recovery. Good luck!

I am trying to size a Make-up air unit for a high rise residential apartment. What diversity would you recommend for the usage? I have: 166 Bathrooms @100cfm 82 Kitchens @450cfm max, 300cfm med., 150cfm min. Thanks in advance.

Does anybody have an opinion on the HvacCad line of software? http://www.mc4software.com/public/prodotti/hvaccad/center.php

I am looking for some direction as to manufacturers of either FRP (fibre reinforced plastic duct) or a plastic duct with a flame spread less than 25. I am working on a project with a Hydrofluoric/Nitric acid hoods that require these ducts. Kind regards.

IRstuff has the right website. But as you can see there is nothing on that to indicate the noise level for that. Kind regards.

We are designing an apartment high-rise with magic-paks for HVAC. The architect would like to see the magic-pak in a closet in the bedroom but I am not sure of the noise levels. Does anybody have any experience with this?

This is a newbie question, I am an EIT. I am specifying Penn Zephyr bathroom fans on a job I am designing. If the performance data says 171 cfm @ 2.0 Sones and I specify a speed controller withing the fan casing to throttle it down to, say, 155cfm, what should my Sones value be? In particular...