When I’ve wrote my “Ductwork Installation Guide” I considered that the next guide going to be about light commercial ductwork installation. But I wasn’t sure that there is a market for this kind of manual.
Nowadays slump in house market driving HVAC installation companies from residential to light commercial installation. If you are working in this kind of company you may face a different environment and meet unexpected difficulties.
In general, light commercial installation is easer then residential, but it is requiring different approach and an installer constantly finding out different types equipment to install. Someone can work for 10 years and still find something new . Also different kinds of commercial buildings will make an installer to run even familiar system of ductwork differently. So, I decided to create this page on my website.
The purpose of this page is:
• To help newcomers with all my knowledge to accommodate a new profession.
• To find out for myself if anyone actually needs this kind of help.
So, if you have any questions go on "Contact Me" page. All my help is absolutely free and I will publish your question and my answer on this page.
Here you can see some pictures which I took long time ago for the “Light Commercial Ductwork Installation Guide”:
Supply duct Supply duct above the sprinkle line Y-branch
Connection supply duct to the plenum Smoke detector Floor penetration
8” heat run 8” heat runs Hanging of the duct
Bath fans exhaust pipe Diffuser connection Linear Register
Question:
“me and a guy are hanging commercial duct we both have 10+ years experiance between us when we come off the sicissor lift to look down at the duct work it looks twisted, we are very experienced at hammering duct work together, i dont get why it is twisted, the duct goes together easy with drives”
So, here are several rules you have to follow when running the duct:
1. Hangers:
• It’s always better to put all hangers on for the same duct size.
For example, if you have to install 40’ of 30” x 14” duct and the distance between trusses is 6’ you have to hammer 6 pairs of hangers.
• When you are measuring where the hangers should be cut, use an electrical conduit. They are always 10’ long and it’s very easy to put on an additional piece to the lengths.
2. Ductwork:
• When you snap a piece of duct together it would be better if sides are matching, but it’s not a big deal if not.
• Don’t put any screws in the seams.
3. Hanging the ductwork:
• Every next piece of duct must be hung with the seam on another side.
• Don’t screw a hanger to the bottom of the duct if there is a seam.
• Don’t try to fix twisted ductwork until first transition or 90’ is installed, or all the system is done.
• If the system of the ductwork is twisted push the corners which are down and up from both sides.
• Secure you job with the screws at the bottom of the ducts.