Regency P42-NG4 - Manual (Page 20)

Regency ® P42-4 Zero Clearance Direct Vent Gas Fireplace 20
INSTALLATION
VENTING ARRANGEMENTS - VERTICAL TERMINATIONS
with Co-linear Flex System for both
Residential & Manufactured Homes
into Masonry Fireplaces
The shaded area in the diagrams show the allowable vertical terminations.