CPRD12 - 12" TrueZONE Bypass DamperHoneywell CPRD12 12" TrueZONE Bypass Damper Time and frustrationtwo things that often accompany the tedium of balancing weights on bypass dampers in multi zone HVAC systems. With Honeywell Home's TrueZONE Bypass Dampers, you get to skip the hassles of counterbalancing and replace it with a simple, pre set dial that needs little or no adjustment. Welcome to an easier, more efficient way to deliver HVAC zoning benefits to customers. The 10 in. TrueZONE