How to vent a tumble dryer through a wall

Question

How do you fit the vent hose through an external wall. Does the hole need any kind of sleeve or weatherproofing?

Simon · Answer

Hi Luke

Yes you need to line the hole with a sleeve which is normally either a rigid type of plastic or metal. You would then need an external vent to be placed on the outside of the wall. There are different types but the most common are a fixed louvre vent, a gravity flap vent (common for tumble dryers etc), or a cowl type vent which is better for exposed locations. This would then need to be sealed with silicone to prevent any water ingress.

Hope this answers your question.

Simon

Zaid · Answer

Drill through the wall and make sure there’s no leaks or cracks around the wall and sure is done properly keep filler near by comes handy

Sprasim · Answer

🧺 Simple Steps: Fit Tumble Dryer Through Brick/Block Wall

Standard size: 100mm / 4 inch hole (fits all UK tumble dryers)
✅ What you’ll need

• SDS hammer drill + 100mm masonry core bit (or long masonry bit + chisel/bolster)

• Long 10mm masonry drill bit

• Tape measure, pencil, spirit level

• Vent kit: metal sleeve, external cowl/grille, internal hose

• Exterior silicone sealant, foil tape, masonry screws

• Safety gear: goggles, dust mask, gloves, ear defenders
📝 Step-by-Step (simple)

1. Pick the right spot

• 30cm+ above ground, clear of windows, drains, electric cables, pipes

• Check no wires/pipes behind — use a detector or drill a tiny test hole first

• Shortest straight line = best airflow

2. Mark & drill pilot hole

• Mark centre point inside

• Drill straight through wall with long thin bit — you’ll see it outside

• Mark the same spot outside, draw a 105–110mm circle (slightly bigger for fit)

3. Cut the main hole

• Best way: Use SDS drill + core bit — go slow, half from inside, half from outside to stop bricks cracking

• Cheaper way: Drill many holes around the circle, then knock out the middle with hammer + bolster/chisel; smooth edges

• Clean all dust/debris

4. Fit the vent

• Push metal sleeve through from outside

• Screw external cowl to brick (flap points down to stop rain)

• Seal all gaps around both sides with silicone — no drafts, no leaks

• Connect rigid or semi‑rigid metal hose to dryer back; use foil tape only (no plastic tape)

5. Final check

• Hose no kinks, no sagging

• Short run (max 3–4m, only 1 bend if possible)

• Test run — air should blow strongly outside
⚠️ Key safety rules

• Never vent into cavity, loft, or room — fire risk from lint/moisture

• No plastic ducting — can melt

• If wall is load‑bearing, consult a builder first

Mihai · Answer

You would normally fit a 100 mm (4 inch) core hole through the external wall for the vent duct. A rigid duct is recommended because it provides better airflow and is less likely to collect lint.

The duct should be installed with a slight downward fall towards the outside so any condensation drains away from the property. Fit an external vent grille with a flap to prevent rain, insects and drafts entering.

Michael · Answer

No pull enough hose through the wall to connect to the back of a tumble dryer vent. Secure it with a jubilee clip and fix it to the external wall.

Mohsen · Answer

Hi Luke
Use a core drill to make the correct-sized opening, fit a proper external vent kit, and connect the dryer using rigid or semi-rigid ducting. Avoid long flexible hoses and excessive bends, as they reduce airflow and increase lint build-up. Seal the external vent properly and always follow the manufacturer's installation instructions

Sandor · Answer

Drill a 125 mm hole and buy the plastic cover to look nice

Andrew · Answer

You vent a tumble dryer through a wall by cutting a 100 mm (4‑inch) hole through the external wall, inserting a metal vent sleeve, and attaching an external cowl/grille plus a rigid or semi‑rigid metal duct from the dryer to the wall. That’s the core takeaway — but doing it well (and safely) requires a few precise steps and materials.

Spencer · Answer

Once the hole is drilled you can use 4inch soil pipe for neatness allowing the flexible tumble dryer pipe to go through but it isn’t essential depending on how clean the brickwork is. You can just put the flexible pipe straight through onto the vent.

Richard · Answer

Yss, you can pick on up from a builders merchant for the size of the vent on your tumble dryer. It would need to be sealed out the outside by some weather proof sealent.  The biggest problem would be core drilling the hole for it. Might be best to get a professional or a condensing dryer.

How to vent a tumble dryer through a wall

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