- Duct shown or specified as
double-wall to be constructed with outer pressure shell, 1", 2"
or 3" thick (as specified) 1-lb insulation layer over a solid or
perforated inner liner. Construct shell and liner of galvanized steel
complying with latest ASTM standards of spiral lockseam and gauged as
specified for pressure class.
- Fittings and coupling: Construct
of minimum gauges as specified for pressure class.
- Perforated inner liner: 24-ga
galvanized steel, perforate with 3/32" holes on 3/16" staggered
centers for a 22% free area.
- Insulation stops: Provide at
all locations where insulation ends.
to Table of Contents
Contact us at: firstname.lastname@example.org
3812 N 39th Ave, Phoenix, AZ 85019
voice ● 602-258-2298 fax