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How much extra BTU do I need to add because of these custom covers?

Joseph_4Joseph_4 Member Posts: 186
I did a heat loss calculation and my room requires an 18 section Sunrad. The home owner wants to put custom wood covers in front of the Sunrad (see pics). How many BTU would you add because of these custom covers?
1200 x 1600 - 206K
1200 x 1600 - 223K


  • STEVEusaPASTEVEusaPA Member Posts: 2,846
    Your really killing convection with that design.
    Maybe you get lucky and the system is oversized.
  • hot_rodhot_rod Member Posts: 11,369
    looks like a pretty restrictive grill? Sometimes the manufacturers of screen give you the "open area" % on various screen material.

    I get special metals from this Chicago area company from time to time, they give you the open area number.
    Screen Shot 2019-06-11 at 9.43.10 PM.png
    1846 x 1828 - 2M
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
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