



VENTS - METAL ROUND BACK VALVE ?315
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
VENTS - METAL ROUND BACK VALVE ?315Backdraft spring loaded damper designed for automatic shutoff of the round ducts and preventing back draft of air when ventilation system is switched off. Damper vanes are opened with the pressure generated by air stream and are closed by the spring. With galvanized axis, and riffles to prevent spring displacement. ? 315
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Reviewed in the United States on March 22, 2026
★★★★★ 5
Hubby was happy
My husband was happy with these. He didn’t complain so gold star.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
If you need them,good place to order them
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Reviewed in the United States on March 14, 2026
★★★★★ 5
Great quality
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Reviewed in the United States on September 9, 2025
★★★★★ 5
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