Custom Ductwork Built in Columbia Falls — Not Waiting on a Truck
Built here. Fit right. Installed without the wait. Honest as a Montana handshake.
When Denning Sheet Metal ran this shop, sheet metal was the backbone of the business. That 10,000 sq ft fabrication capacity is still here under Western Sky Heating & Cooling — and for Flathead homeowners, it means something simple: we can build the ductwork and fittings your home actually needs instead of forcing a catalog piece and hoping.
This page is the Columbia Falls residential fab story — service and retrofit installs for homes, not a commercial bid packet. The dual-valley category page stays at /services/ductwork.
Why in-house fab matters on a residential job
Most service companies order fittings and wait. On a replacement, that wait is days you don’t have heat or AC. On a repair, it’s a temporary patch that becomes permanent. Our Columbia Falls shop builds transitions, boots, boxes, and custom runs sized to your house — then our install crew puts them in.
This page is about your home — service and retrofit installs — not a commercial bid packet for general contractors. Commercial fab marketing lives elsewhere; we don’t blend that nav into this homeowner page.
What we fabricate for homes
Supply and return duct modifications for furnace and heat-pump changeouts. Custom fittings when the old layout doesn’t match a new cabinet. Trunk and branch repairs after damage, remodel, or wildfire-season filter upgrades that need better sealing. Quiet-path layouts for Whitefish and second-home comfort, including zoning-friendly runs where the job calls for it.
We’re a Lennox dealer for equipment — support, not the headline. The headline is craft metal that fits Montana houses.
A careful note on Custom Metal Works
Western Sky’s fabrication shop also supports a separate fabrication line of business. On this residential page we mention fab only as capacity that backs your install: schedule certainty and fit quality. We do not publish a separate CMW phone here, and we do not fold CMW commercial marketing into the Columbia Falls homeowner navigation.
How it shows up in a quote
You’ll see line items for fabricated duct and fittings when the job needs them — not a vague “misc sheet metal” lump. Transparency on labor and metal, in writing, before we start.
Ask about fabricated-here duct
Replacing a furnace, adding a heat pump, or fixing ducts that never fit right? Call 406-296-3336 or send the form. Same Highway 40 shop. Metal built for your house.
What you can count on
Frequently asked questions about custom ductwork
Built in Columbia Falls — fittings and duct for residential service and retrofit, not a GC bid packet.
Do you really build ductwork in Columbia Falls?
Yes. Western Sky operates the fabrication shop at our Columbia Falls location — the same shop footprint many homeowners knew from Denning Sheet Metal days, with substantial on-site fab capacity. Residential installs and service jobs can use fittings and duct built here. Call 406-296-3336 or use the form.
Is fabrication only for new construction?
No. This page is for service and retrofit/replacement — the work Flathead homeowners call us for. New-construction GC bid marketing is a different track and is not what this Zero-Click page sells.
Will fab slow my install down?
Usually the opposite: building here cuts supplier lag on non-standard pieces. Your tech or estimator will say when a part is stock versus shop-built. We don’t invent hour-turnaround guarantees on the website.
Are you Custom Metal Works?
Custom Metal Works is the fab shop brand for external / metal-line work (own site and phone when that brand publishes). This residential HVAC surface is Western Sky Heating & Cooling. Fab capacity supports your home install; phones and navigation stay separate — we never put a CMW number on this page.
Can you fix only one bad fitting?
Often yes — start with a diagnostic visit, then a repair quote with line items for metal and labor. Call 406-296-3336 or use the form.
Do you publish prices for ductwork?
Per job, because every house is different. We put metal and labor in writing before we start. Diagnostic and membership fees have their own transparency pages when pricing is unlocked.
Do you serve Columbia Falls, Whitefish, and Kalispell for custom duct?
Yes — from our Columbia Falls shop, we serve Columbia Falls, Whitefish, and Kalispell through the Flathead engine (/columbia-falls/whitefish/..., /columbia-falls/kalispell/...). Call 406-296-3336 or send the form.
Why does in-house fab matter on a furnace or heat-pump changeout?
Catalog fittings don’t always match an older Montana house. We can build transitions, boots, boxes, and custom runs sized to your layout — then install them — so you’re not stuck waiting on a truck for a piece that still won’t fit right.
Ready to schedule custom ductwork in Columbia Falls?
Call the Western Sky Heating and Cooling team or send us a message.