The concealed 5030 Series PACER is a heavy duty closer designed to fit in a narrow, minimum 1-3/4" aluminum transom. The double lever arm provides superior door control. UL and cUL listed for self-closing doors without hold-open. Spring power and latch speed adjustments are independent for either swing. Backcheck and general speed adjustments are common for both swings. Designed to fit in a narrow header. Aluminum frame requires minimum1-3/4" x4-1/2" tube. Materials for the closers include a cast iron cylinder, one-piece 1-1/8" diameter forged steel piston, 11-16" diameter double heat treated pinion journal, and high-efficiency, full-complement, low-friction bearing. Select closer based on width of door. Closing power of all 5030 Series closers may be increased 50 percent. Specify next higher size closer where strong drafts exist.