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.

Tapered cavity wall weep vent with an open drainage outlet

Weep Vent

ACS Weep Vents are manufactured from a single piece of Grade 304 stainless steel, requiring no on-site assembly. Because the vent is stainless steel throughout and sits on a stainless steel cavity tray, there are no dissimilar metals in contact and therefore no risk of bi-metallic corrosion – the common cause of premature failure where mixed metals meet in the cavity. A front lip on the vent directs water away from the face of the brickwork.
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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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Tested, Certified, Trusted

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

The ACS Weep Vent Technical Data Sheet covers the product summary, sizing, bi-metallic corrosion guidance and A1 classification detail.

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.

Weep vents are supplied in a standard 65mm height, with a version sized specifically for use with pistol bricks.
No. ACS Weep Vents are Grade 304 stainless steel, the same material composition as ACS cavity trays, so no dissimilar metals come into contact and the risk of bi-metallic corrosion is eliminated.
Yes. Referring to document 96/603/EC, the stainless steel weep vent is classified in Class A (“no contribution to fire”) without the need for further testing, satisfying the requirements for an A1 classification.

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