Help Running Heat Runs 40'x64'x17'

[nomadskidoo]

Yep:Heating a Shop,w/ (LP,Old house 85% effy @86,k) 40'x64'x17' running 4 X8"x 25' heat runs,out @90 % angles should work ok?Just checking for Help, ,,thanks!

 

[PWC Repair]

Sounds like that furnace should have 1000-1200 cfm blower. 4x eight inch runs is not enough. Are you actually trying to heat this large shop or just keep it 50* or so?