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62 si nfa (square inches of net free ventilation area)
Note: These are made for thin materials like metal or glass or plastic
They are great for stairway
They are easy to install into a 4" hole made by a drill-type hole saw
RSTBL-100 4" 4PK
6" Round Open Screen Vent w 1/4" mesh, black - bag of 2 Stainless Steel Vents 62 si nfa (square inches6" Black Open Screen Vent, 1 4" mesh bag of 2 RBLS 104 6"2PK These small round vents are made of Aluminum. They have a strong 1 4" screen to keep insects out. They are easy to install. They fit into the hole made by a drill type hole saw and are held in place by knobs on the side of the vent. No nails or screws are needed. 16. 970 si nfa (square inches of net free ventilation area). Bag of 2 vents. Made in the USA. Orders placed by 3 pm MDT will ship
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