How to run ductwork through a load-bearing wall without weakening it
Routing supply plenums and vent hoods often requires cutting or notching framing members right where the duct needs to go. This leaves homeowners stuck between risking structural stability or sacrificing airflow with awkward bends and off-center runs.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 11.0× more often in r/hvacadvice than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
How to run ductwork through a load-bearing wall without weakening it
- 1hire a structural engineerDid this help you?
- 2install a beam to distribute weightDid this help you?
- 3Using multiple elbows to route the duct around the framing obstacleDid this help you?
- 4Cutting the stud and installing a header to clear the pathDid this help you?
- 5using offset elbows to route ductwork around the obstacleDid this help you?
- 6cutting the stud and building a header and footerDid this help you?
- 7Using a heat gun to make PEX flexible or letting it sit in the sunDid this help you?
- 8Snaking pipes through carefullyDid this help you?
- 9Accepting the use of many couplingsDid this help you?
- 10Reorienting the exhaust fan motor upward to route above the applianceDid this help you?
- 11Using duct elbows to offset the venting into an adjacent open wall bayDid this help you?
- 12Hiring a contractor to perform structural reframingDid this help you?
- 13Leaving the abandoned duct alone if it is already closed offDid this help you?
- 14Routing the cable through the duct but ensuring the ends are tightly sealed to prevent garage fumes from enteringDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I was originally going to vent straight back, but it turns out there is a stud directly in the center of where the hood will go (technically 12.5-14" from the right side, 30" cabinet), so I was planning on instead venting up into a 45 to go left, and then another 45 to go out the side and sneak around the stud.”source ↗
“I would like to add an exterior exhaust for our microwave but I’m concerned about the studs that are in the way.”source ↗
“It’d require reframing around the exhaust cutout on the interior side. My original intention was to do this on my own but I’m intimidated by the triple studs from a load bearing perspective.”source ↗
“Im installing a furnace and complete new duct work in my new (very old) home and need to get my supply plenum to the other side of this wall.”source ↗
“I dont want to risk compromising the support since it requires me to notch/remove building material.”source ↗
“I was originally going to vent straight back, but it turns out there is a stud directly in the center of where the hood will go (technically 12.5-14" from the right side), so I was planning on instead venting up into a 45 to go left, and then another 45 to go out the side.”source ↗
“Is that foolish and going to destroy my static pressure, or would that be reasonable since it's such a short run?”source ↗
“For copper you're basically playing operation, but with a drill and a lot of cussing. And yeah, sometimes the purse comes out and you just accept the couplings.”source ↗
Where this came up
People with this problem also raised
- 3How to run electrical wire through an exterior wall safely
- 2Can you move a waste pipe inside a wall near outlets?
- 4How do I connect a flanged boot to rectangular duct?
- 9No room to fit a plumbing vent in tight spaces
- 2How to build a closet around exposed ductwork
- 4Can you use SharkBite push fittings behind a wall?