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Wndf built in constant air volume valve

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Wjdf round constant air valve

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Sfd-p smoke and fire damper (National Standard Code: pyf-sdc / DJ-K)

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Sfd-y smoke and fire damper (national standard code pfhf wsdc / dj-y / k)

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Sfd-t fire damper (National Standard Code: FHF wsdj / dc-fk)

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Sfd-f fire vent (National Standard Code: FHF wsdj / dc-fk + aluminum alloy vent)

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