Custom Metal Work
Send us your measurements and we build it from galvanized steel in our own Windsor shop. Plenums, Y branches, transitions, trunk line and the one off pieces nobody stocks. Pickup or delivery. One contractor for the whole job: the same crew also installs furnaces, water heaters, heat pumps and central AC.
Built to Your Numbers
MDMC takes the metal industry seriously. Mike has more than 30 years in sheet metal and HVAC, and the shop at 1429 Pelissier Street in Windsor has its own brake for cutting and bending galvanized steel. Contractors, HVAC shops and builders send us their measurements and we build the piece.
Box store fittings cover the common sizes. Real jobs are not always common. When a new furnace sits higher than the old one, when a trunk line has to jog around a beam, or when a rooftop unit needs a transition that no catalogue lists, the piece has to be made. That is what the shop is for.
Who uses the shop
- HVAC contractors who need a fitting made fast for a job in progress
- General contractors and builders on new construction and renovations
- Mechanical and commercial shops needing rooftop or combination unit transitions
Fittings and Ductwork
Plenums
Supply and return plenums sized to the furnace or air handler.
Send specs → 02Y Branches
Wyes to split one run into two with smooth airflow.
Send specs → 03Transitions & Offsets
Change size or shape, or shift a run around an obstacle.
Send specs → 04Trunk Line Ducts
Rectangular trunk line in the lengths and sizes you need.
Send specs → 05Takeoffs & Elbows
Takeoffs and elbows to connect branch runs.
Send specs → 06Combination Unit Transitions
Transitions for combination heating and cooling units.
Send specs → 07Rooftop Transitions
Transitions to connect rooftop units to the duct system.
Send specs → 08One Off Custom Pieces
Anything else made from galvanized steel. If you can draw it, ask us.
Send specs →From Sketch to Steel
Send your measurements
A sketch, a drawing or a photo with dimensions works. Use the form and pick the contractor option, or call the shop.
We confirm the details
If anything is missing, like the gauge, the connection type or which way an offset goes, we ask before we cut.
Built in our shop
The piece is cut, bent on our brake, assembled and sealed.
Pickup or delivery
Pick it up at the shop on Pelissier Street, or ask about delivery to your job site.
Get It Right the First Time
- All dimensions, with which side is which
- Inlet and outlet sizes for transitions
- Offset distance and direction
- Connection type on each end
- How many you need
- When you need it and where it is going
- Size of the piece and the amount of steel
- How many bends, seams and connections it has
- Quantity, since repeat pieces go faster
- How soon you need it
- Pickup or delivery
Every order is quoted from your measurements before we build.
Recent Pieces




Fabrication Questions
Do you sell to contractors?
Yes. Contractors, HVAC shops and builders are the main customers of the shop.
What material do you work with?
Galvanized steel, cut and bent on our own brake in Windsor.
What do I need to send for a quote?
A sketch, drawing or photo with all the dimensions, plus the quantity and when you need it.
Can you make a one off piece?
Yes. One off custom pieces are a big part of what the shop does.
Do you deliver?
You can pick up at the shop on Pelissier Street, or ask about delivery to your job site.
Got a Piece Nobody Stocks?
Send your measurements or call the shop. We build it in Windsor.
