It's essential to maintain proper ventilation for gas furnaces and gas water heaters to ensure safety and optimal operation. These appliances require a sufficient supply of fresh air for combustion to prevent the buildup of harmful gases, such as carbon monoxide (CO).
The two fresh air vents in the room are likely there to provide cross-ventilation and ensure an adequate air supply for the gas appliances. Closing off one of the vents can disrupt this balance and may lead to several issues, including:
Inefficient combustion: A reduction in fresh air supply can cause incomplete combustion of the gas, leading to reduced energy efficiency and potentially producing more carbon monoxide.
Safety concerns: Insufficient ventilation can increase the risk of carbon monoxide buildup, which is a colorless, odorless, and deadly gas.
Appliance malfunction: Gas appliances may not operate correctly or may shut down automatically if they sense inadequate air supply.
Given that safety is the primary concern, it's generally not recommended to close off either of the fresh air vents in the room with gas appliances. Instead, consider these alternative solutions to address the cold air infiltration:
Seal drafts: Identify and seal any drafts around windows, doors, or other openings in the room to reduce cold air infiltration.
Insulate the room: Adding insulation to the walls and ceiling can help retain heat and reduce the impact of cold air leaking into the room.
Use weatherstripping: Install weatherstripping around doors and windows to create a tighter seal.
Install an air curtain: Consider using an air curtain, which is a device that blows a stream of air across the entrance, creating an invisible barrier to prevent outside air from entering.
Adjust heating settings: If possible, adjust the temperature settings on your furnace or water heater to maintain comfort while minimizing energy usage.
If you are concerned about the effectiveness of your current ventilation setup or have specific energy-saving goals, it's best to consult a qualified HVAC professional or a licensed technician. They can assess your situation and provide tailored advice to ensure both safety and energy efficiency.