TVD-B-40C2-BG
Galvanized construction, aerofoil blade, Class 2 leakage at 350° F, 6 in. wg pressure, 3000 fpm velocity, 250° C for 2 hours, UL 555S
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TVD-GB-40-B
Galvanized construction, stainless steel aerofoil blade, Class 1 leakage at 350° F, 20 in. wg pressure, 4000 fpm velocity, 4 hours fire rating, 250° C for 2 hours, 3.5 million pressure reversal cycles, BS 476
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TVD-GB-40-B
Galvanized construction, aerofoil blade, 20 in. wg pressure, 4000 fpm velocity, 4 hours fire rating, 3.5 million pressure reversal cycles, BS 476
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TVD-SB-40-B
Stainless steel construction, stainless steel aerofoil blade, Class 1 leakage at 350° F, 20 in. wg pressure, 4000 fpm velocity, 4 hours fire rating, 250° C for 2 hours, 3.5 million pressure reversal cycles, BS 476
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