HVAC: Installing a ceiling unit. Is this against code?


Photo by BlxckTxpes

Unless you oversized the rod that supported the sprinkler line, it may violate code.

Usually, plumbers (or any other trade) put the minimum required sized rod for their own hanger system. They don’t upsize unless it’s agreed upon before install.

I’ve been on a few jobs that I’ve actively gone to other trades and reworked the hanger systems.

For example – Our ductline took up the whole hallway. Engineered drawings stated HVAC elevation as ceiling down to 2′ below ceiling. The electrical elevation was just below that. For them to hang their cable tray, they would have to anchor outside the duct, and then span the whole hallway with unistrut. (their cable tray was about 16″ wide)

1- They would have to drop their threaded rod first down the length of the hallway as there was no “safe” way to get to the ceiling after the ductline was in. (And then I’d have to deal with their rods as I was installing)

2 – It’s a waste of unistrut to put up 6 feet worth to span the hallway for a 16″ cable tray.

3 – It’s a waste of threaded rod for them to drop from the ceiling (although it was probable bid on, hanging from the bottom of the ductline would save them 4′ of rod per hanger which equates to a higher profit for them.

4 – They would have to pull off another location to come and put in their anchors and rods which would have held up production for both us and them.

In the end, I made a deal with them that I would use their materials (upsized rod that would support both HVAC and Electrical tray AND their unistrut (which they would have used anyways to span the whole hallway) Saving the HVAC company the cost of rod and unistrut and saving the Electrical company the labour cost of installing their hanger system. – RWCheese

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20 Jul

HVAC: Dealing with safety issues such as cuts?

snipsSirmish asks:

My boss is pretty adamant that we wear gloves. We use the nitrate palm gloves so we have some grip on the ductwork. It doesn’t protect from more than fish hooks on the metalwork it seems to me though.

Do you guys have your installers where any particular gloves to help with this?

PestilentSwarm responds:

Practice. After a while you get used to holding edges without the edges grabbing you. You’ll also get used to using snips and having clean cuts all the time.

One tip for snips, don’t squeeze them all the down for every cut. If you do smooth motions and only go about halfway down you’ll find it much easier to cut clean, straight edges. Also, when holding snips don’t wrap your thumb around the handle. Just it rest along the top edge of the snips. This will keep you from cutting that meaty part of your thumb/palm along the edge of the sheet metal.

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12 Jul