There is a large PVC pipe (3 actually) which vent air intermittently. I started noticing I could see steam rising over my deck in the morning and then I found that these pipes vent air at least a couple times per hour.
What is the purpose of this venting? I'm concerned about efficiency.
Bonus: When the pipes are venting it is fairly noisy. When we're on our deck we can hear it and it's annoying. Any way to muffle this noise without impacting the operation?