viscous filter

viscous filter

[¦vis·kəs ¦fil·tər]
(engineering)
An air-cleaning filter having a surface coated with a viscous liquid to trap particulates in the airstream.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

viscous filter

A filter for cleaning air; dirt, carried by the air, impinges on a surface covered with a viscous fluid or oil, to which the dirt particles adhere.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.