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Although the quote doesn't specify it, the other heights reference an outdoor elevation. I would assume that the 3" is for a wholly indoor application. But assumptions are dangerous in interpretation of building code.

This has more to do with CO and diesel particulates than flammability. Noise from the mechanical room can also be a consideration. Forced entry through the louver. Diesel particulates will quickly build up on condenser coils and air filters.

Sez so right in the link. "Aftermarket Part".

This isn't an OEM part. No wonder why it doesn't fit right.

Don't know what the "RT" designation means, or what the difference is, but you could have bought a factory recon for about $350.00...

I have installed product just like this for a food grade dust collection system, and there were adjustable slip pieces that were used for oddball length adjustments. A shorter piece plus the adjustable piece made up the finished dimension. It was a long time ago, and do not recall making any...

I worked with someone that had the bright idea to use a plasma cutter to cut openings into a stainless steel commercial kitchen hood for the ductwork (not all of these have openings from the factory). Yeah, it was fast. Yeah, it was easy. But what a ******* mess. The stuff coming out (sparks...

This will work, have used it to cut lots of spiral ductwork: https://www.milwaukeetool.com/products/details/m18-fuel-metal-cutting-circular-saw/2782-20 Have also used the corded version of this, has much better chip containment than the one above...

I know that people don't want to hear it, but there is no way to *LOOK* at the flame from an induced draft burner, and tell if it is OK or not. A problem is only noticeable when it is really bad, and probably at a point when it trips a safety.

Your going to have to pull that heat exchanger out and dip it in something to clean it. Or, replace it.

"It's working and looks ok to me". 😁

Propane? Looks like a fuel pressure issue. This is why stuff needs to be checked with a combustion analyzer. Ha. That's what you think. Just because it turns on, doesn't mean that it's working.

I recently looked at an installation where the water heater was jammed under a stairway. There is no physical way to install it 18" above the garage floor- which would be ~12" above the floor in that "mechanical room". Stairway was next to the garage. The whole inside of this little room was...

There are things that can make a "garage mechanical closet" separate from the "garage", but the process seems to be very rarely done correctly. At a minimum, there is a combustion air requirement and the door needs to be: self closing, sealed and have a fire rating (IIRC). Either the AHJ...

Burner has to be 18" above the floor. Not necessarily the furnace.

Better efficiency and/or lower bills are not guaranteed if the new system is not matched or installed properly. Sounds like you received a good one though. Yes. Not sure on the lender issue part, but definitely a buyer issue. Yes. I have one customer that has put off replacing an aging...

Only you can decide this. I am a firm believer in preemptive replacement, because the downtime is under your control. There is no way to tell how much longer it will last, without having trending data like megger readings on the compressor. I have also seen many units that appear to be working...

I would start here: https://buildingperformanceworkshop.com/homeperformancediagnosticsbook I attended some of his classes when he was in the Chicago area.

I have read stuff online where an old 4" abandoned dryer vent into the attic leaked enough air to create humidity problems. Rim joists weren't sealed, and there might be can lights in those joist bays. The mudsill (maybe what you are calling the band board?) just rests on fiberglass or foam...

Outside will impact inside, less if the the house is super "tight" or otherwise energy efficient. The Aprilaire humidifiers, fan or bypass, do work; but if the house is "loose", then they will not be able to hit a higher desired indoor setpoint even if the humidifier is fan powered, connected...