Bebco Building Pressurization Unit, Air Stack

Bebco Model SPSA Spiral Pipe Stack  

Assemblies are formed from a combination of Model SP Spiral Pipe, Model ST Spiral Tees, 

Model SN Spiral Nineties and Model SC Stack Caps, along with a host of critical accessories to 

provide seals, flexible connections and structural support for the complete stack  assembly. 

When combined as required, these products provide economical fresh air intakes for Bebco 

Pressurization Units, Ventilation Units, Air Conditioners and Gas Phase Filtration Units, to acquire 

air from a source above any concentration of flammable, toxic or corrosive vapors that are above 

acceptable levels of concentration at ground level. 

Spiral pipe and fittings are available in 8” to 24” standard and custom diameters in 16 or 20 gauge 

galvanized steel, 304 Grade stainless steel or 316 Grade stainless steel materials. 

Galvanized material may feature no finish, a hot dip galvanized finish or an exterior surface urethane 

finish. Stainless materials may feature no finish or an exterior surface urethane finish. The bodies of 

all fittings are seal welded. Flanges on galvanized spiral pipe and fittings can be seal-welded or tack-

welded and sealed by marine grade calking or a hot-dip galvanized finish.  Flanges on stainless spiral pipe 

and fittings can be seal-welded or tack-welded and sealed by marine grade calking.