A nearby exhaust opening may become an intake path instead of drawing air from the eaves. Map ridge, box, gable and powered vents before adding another exhaust product.
Inventory before adding an opening
When an attic already has a ridge vent, a gable opening and a powered fan, an additional box vent should not be treated as an isolated purchase. Give each existing opening a label on a roof sketch. Identify the attic space it connects to and whether it will remain active. Ask the contractor to explain the proposed airflow route using that same sketch, rather than relying on a general statement that more ventilation is better.
Ask what is being retained
A replacement proposal should say what happens to each old opening. Leaving that decision until installation can create disagreement over patching, wall finishes or electrical work. If a vent is to be closed, ask how its former opening will be reconstructed and who is responsible. If it stays, ask how it fits the selected system. A powered unit also needs coordination with the person responsible for its electrical connection.
Keep the before and after plans
Save photographs and the marked plan with the roof records. A future electrician or insulation contractor may otherwise see a redundant-looking opening and change it without understanding the arrangement. For an actual complaint, document the conditions that led to the proposed change: heat concerns, moisture observations or a manufacturer's installation requirement. Distinguish those concerns from a promise about future utility bills. Completion photographs should identify the openings that were removed, retained and added.
For example, a homeowner might replace roofing while keeping a fan installed by a previous owner. Flag that fan during the estimate visit instead of allowing its fate to be decided during tear-off. Ask whether removal would involve an electrician and a roof opening repair. Resolving the arrangement early makes the contract and the final photographs much easier to interpret.
For related project preparation, see roof ventilation changes during replacement and roof replacement sequencing with attic insulation work. Bring the relevant photographs and existing proposal to Perkins when discussing the roof-specific scope.
Technical references: GAF: proper attic ventilation; GAF: ventilation by roof style. These references provide background; the selected assembly and applicable project requirements determine the installation detail.