Van-Packer DW and DW plus

Double wall positive pressure chimney and breeching systems.

Description/Application Double wall air or optional fiber insulated positive pressure system for
venting boilers, kilns, grease ducts, emergency generators, caustic air, coffee roasters, bagel
ovens, bread ovens, pizza ovens, and fumes.
Maximum Temperature Continuous Firing Dual listings of 1000 and 1400F
Maximum Temperature Intermittent Firing Dual listings of 1400 and 1800F
2000F for grease duct applications
Fuel LP gas, natural gas, #2, #4*, #5*, or #6* fuel oils, wood*, coal*, diesel fuels, grease vapors,
caustic fumes, and particles. (*It is recommended that 316 stainless steel liner be specified when
using these types of fuels.)
Construction Diameters:
Inner liner 6 36ID = 20-gauge stainless steel
Inner liner 38 48ID = 18-gauge stainless steel
Outer shell 8 26OD = 24-gauge aluminized, 304 or 316 stainless steel
Outer shell 28 56OD = 20-gauge aluminized, 304 or 316 stainless steel
Insulation DW One inch air space between shell and liner
DWplus One, two, three, or four inch fiber insulation
Joint Method The liners are flanged and the product comes with joint sealant and vee bands to
ensure product integrity is maintained. The outer shells are joined by flanged bands to ensure
environmental protection.
Diameters Available 6 through 48 in two-inch increments are standard.
Clearance To Combustible
DW - 1000F applications = 4 1400F applications = 6
DWplus - 1000F applications = 2 1400F applications = 4