Section 44(3) in West Bengal Municipal (Building) Rules, 2007
(3)All openings in such foundations or floors, windows and drains and all junctions between foundation walls and building walls shall be effectively rat-proofed, windows and doors shall be tight-fitting, other openings shall be securely covered with rat-proof screening or shall be tightly closed with metal sheeting, concrete or other equal rat-proof materials as may be approved by the Board of Councillors.
