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Mikesolar · 09-28-14, 05:42 AM

More than 3/4" air gap (in a window) promotes air movement by convection and therefore heat loss. Most double glazing is limited to that. Triple is usually 2 x 3/8 or 2 x 1/2'

09-28-14, 05:42 AM	#44
Mikesolar Master EcoRenovator Join Date: Aug 2012 Location: Toronto Posts: 958 Thanks: 40 Thanked 158 Times in 150 Posts	More than 3/4" air gap (in a window) promotes air movement by convection and therefore heat loss. Most double glazing is limited to that. Triple is usually 2 x 3/8 or 2 x 1/2'