Constructed of 16 ga galvanized steel bronze oilite bearings,    1/2" plated shaft                                                           Galvanized connecting bar with provisions for counter-balancing 

Options:                                                                            Model model RD-426 with a 4" depth                                  .063, .080 .125 aluminum, copper or stainless steel construction Teflon® bearings, jamb and blade seals.

NOTE:                                                                                   Not recommended for velocities exceeding 1,500 fpm

constructed of 16 ga galvanized steel frames and .025 formed aluminum blades.  bronze oilite bearings, cadmium plated pins in brass eyelets poly foam blade edging.  

Maximum section size 36" x72"

Options:                                                                         Available in stainless steel or aluminum

NOTE:                                                                                   Not recommended for velocities exceeding 1,000 fpm

constructed of 16 ga galvanized steel frame and .025 formed aluminum blades, bronze oilite bearings cadmium plated pins in brass eyelets, poly foam blade edging

Maximum section size 36" x72"      

Options:                                                                       Horizontal mounting or stainless steel construction

NOTE:                                                                                   Not recommended for velocities exceeding 1,000 fpm