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[Dano]

Hi guys This is my first post on the site. I have been watching and learning since last year.  Great site! I have a Question for everyone. Has anybody used patio block for a base? I have Jest bought a ml30 portage & main furnace and want to get it installed quickly before it gets cold. Any ideas would be helpful. Also I may have to install the core in the return side of the plenum instead of the supply. Anyone doing this?  Thanks

[Scott7m]

Yes you can install on the return side of the furnace, often timed I make another place for a filter right before the air enters the coil so you aren't running unfiltered air through it.

4" cap block are fairly common, I don't like doing it that way but some people have to.  The thinner patio block would make a bigger foot print but only using 1 layer might be to weak. 

[MattyNH]

 Ive seen patio brick used, seen cinder blocks as well used for the base..I have mine set on a poured concrete with rebar and 3 feet of crush stone beneath it.. OWB has never moved nor the pad cracked due to frost

[fireboss]

I have mine sitting on about 8" of 3/4 stone  has not moved at all!