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________________ are made of mats or screens of split wire or glass wool or such other material and coated with non drying viscous oil.

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________________ are made of mats or screens of split wire or glass wool or such other material and coated with non drying viscous oil.

(a) Dry filters

(b) Water sprays

(c) Electric precipitator

(d) Viscous filters

This question was posed to me during an internship interview.

Query is from Variations in Ventilation System with Climate in division Acoustics and Ventilation of Construction & Building Materials

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Correct answer is (d) Viscous filters

Best explanation: The viscous filters maybe of unit type or automatic type. In the former type, the Mats are replaced when they become dirty or they are washed and recoiled. In the latter type, an endless chain moving over the mats is provided.

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