Metal-Fab Type B-Vent 6" x 6" x 4" Swivel Wye w15.5 Hidden venting and no grills:

Hidden venting and no grills: The heater is located at the top of the SYM-34-XT fireplace allowing heat to cascade down in front of the glass

For use with BHD4 Series Fireplaces

so the above limitation may not apply to you

Louver kit for MDV31 and MVF40 corner applications

Size 5" Diameter 5DT-ST Standard Tee w/Cap A 5" B 7" C 5 1⁄2” D 6 E 12 5/8”

Metal-Fab Type B-Vent 6" x 6" x 4" Swivel Wye w15.5 Hidden venting and no grills:Type B Gas Vent products are tested and listed to UL 441 for approved gas appliances and feature our innovative twist lock connection and locking tab, eliminating the need for sheet metal screws. Metal Fab Type B Gas Vent combines hemmed flues and casings that maximize product durability and reliability and minimize installation time. Designed for versatility, Metal Fab Type B Gas Vent products 3" 6" adapt to major competing brands and when installed