Frequently Asked Question
Yes, it's okay to add ventilation to your existing system. However, only add the SAME TYPE OF EXHAUST ventilation as your home currently has installed - do not mix exhaust products on the same common attic space. If Whirlybirds® exists, add Whirlybirds®, if roof louvers exist, add roof louvers.
Keep in mind you want to install all exhaust ventilation at the SAME HEIGHT within a common attic area.
Also, do not overlook the intake part of the system. A BALANCED SYSTEM must have 50% exhaust and 50% intake. If you add exhaust ventilation, make sure you have at least 50% of the ventilation located in the soffit.