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Another manufacturer, Desert-Aire, provides very good design information and design program. The system will need to meet particular requirements, but those requirements are well-known and documented. I agree you will want to review the ASHRAE guidelines. timr

If the areas being served by the air handlers have unoccupied hours, i.e., the areas are vacated at night, more likely than not the dampers are required by code. Typically, outside air dampers serving an air handler are required by code to fully close during unoccupied hours. You may want to...

Have you tried United McGill? Their web site is: www.unitedmcgillcorp.com Good luck

You need to provide more information. What type of application, ie, residence, institutional, commercial, anticipated velocity(if known), etc. There are rules of thumb. Just keep in mind rules of thumb are conservative, so an estimated static using rules of thumb should be higher than actual...

&nbsp;&nbsp;&nbsp;&nbsp;I have not used this forum before and hope this is an appropriate subject.<br>&nbsp;&nbsp;&nbsp;&nbsp;I am searching for suggestions for control strategies.<br>Setting:&nbsp;&nbsp;Child's reading room in a to-be-built public library.&nbsp;&nbsp;The room will have hydronic...