Technical Data Sheets
Certifications
Weep Vent
ACS Weep Vents allow water and moisture collected within a cavity build-up to drain away from the structure. Positioned on a cavity tray, the vent expels moisture gathered by the tray back out through the external wall, and is manufactured from stainless steel for an A1 non-combustible solution that meets updated Approved Document B guidance.
Technical Data Sheets
Certifications
Weep Vent
Want to learn more about our Weep Vents?
The Technical Data Sheet covers sizing, bi-metallic corrosion guidance and A1 classification. If you’re unsure about a particular detail, our Technical Engineering Team is happy to help.
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Key Specification Details
- Manufactured from a single piece of Grade 304 stainless steel
- No on-site assembly required
Provides an A1 non-combustible solution - No risk of bi-metallic corrosion — stainless steel throughout, with no dissimilar metals in contact
- Available in a standard 65mm height, with a version sized for pistol bricks
- Front lip directs water away from the face of the brickwork
- Suitable for use in the external wall build-up
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ACS Weep Vents are produced from stainless steel and, referring to document 96/603/EC, are classified in Class A (“no contribution to fire”) on account of the material’s low level of combustibility, without the need for further testing.
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Technical Data Sheet
FAQs
When should I specify a weep vent?
Weep vents are specified wherever a cavity tray needs to expel collected moisture from the external wall build-up, keeping the tray functioning as intended.


