Isn't this against code ??

[wantboost]

[Admin]

It looks like a clean install but there's a lot going on there.  I would have to read the installation manual but there are some infractions and grey area issues.

Sometimes there's a minimum the venting must run in 2" before transitioning to 3", and it's hard to tell if those joints are even glued.

Some manuals require a ground joint union and some inspectors want a union installed when CSST is used.  Without a union you would have to turn the gas meter off if you wanted to replace the furnace gas valve.  The shut off would have had to been installed upstream of the CSST for it to be at least be serviceable.

Some inspectors take issue with screwing into the furnace cabinet and some would tell you that isn't a firm and level base because of the gap between the concrete blocks.

It's hard to see all the electrical but there are a lot of question marks here.  Is an HVAC worker even allowed to install a branch circuit and install a 120V plug?  Does it have to be GFI because of it's proximity to source of water?  Is that switch the furnace power switch or low speed fan switch?  The furnace power switch can't be installed on the furnace.  What is that wire that's going into the blower cabinet?  There should be a connector to seal that cabinet.

I would have installed an air vent at least 1" higher than the drain line leaving the furnace.

And what's that sitting on top of the furnace?  Not something important I hope.

[slo-115]

Can't install the unit on blocks. I was always taught if they break it will snap the gas line. Then again i could be wrong

[Porcupinepuffer]

I would think the union is inside the cabinet?

It almost seems like this additional switch and plug might be something done for hooking up a generator to the furnace. But that's just a guess.
As for the bricks, I've heard if the furnace is to be raised it should be one continuous pieces and non-movable. We've used patio stones that were glued down with pl premium or cemented in place. 

[Admin]

Yes good point.  Actually most Rheem manuals show the union inside the furnace cabinet.

[NoDIY]

That is not a manufactures certified base

[Admin]

I'm not 100% sure about that furnace but the Lennox EL296 manual says,

When installing the unit in a crawl space, a proper support platform may be created using concrete blocks.

I realize most furnaces aren't installed in crawl spaces but if it works there why not anywhere?  This has always been a grey area issue it seems.  In the country it makes sense to raise a furnace to avoid flooding.  If I frame a raised wooden platform what's the difference between the actual floor and platform?  I suppose then we may have to secure the furnace to satisfy the seismic restraint Codes, if applicable. (OBC Article 9.33.1.3)

NOTE - For installation on combustible floors, the furnace shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring.

Since when is tile combustible material?  They must mean vinyl tile, not masonry.

I've only had one TSSA inspector use Clause 7.13.1 and state that leveling a furnace with S-cleats is illegal.  As well the picture above has gaps between the blocks, so it could be argued it is not a firm base as it does not cover the entire bottom of the furnace.

Clause 7.13.1 - A central furnace shall be installed on
(a) a firm, level base;