Length – 795mm 2x 400mm Trickle Vents + Jointer. Length – 595mm 2x 300mm Trickle Vents + Jointer. DETAILS 795mm. DETAILS 595mm. Equivalent area as per BS 13141-1:2019 – 2328mm2 Air Flow is Based On 1 Trickle Vent .
eBay