Active Vs Passive Attic Ventilation

Any unconditioned attic requires ventilation.

Active vs passive attic ventilation.

Taking advantage of this natural process referred to as passive ventilation. This type of ventilation is especially important for. Passive active options. Hip roof with not much space vents.

Use avp s roof vent calculator to determine the number and size of exhaust vents you will need. Below are pictures of common static roof vents also called passive roof vents and gravity roof vents. Active roof vents will exchange the air inside the attic with fresh air from the outside many times faster than passive vents. Since i want to reduce the heat load on the house to limit a c bills i need to install vents in the roof.

Passive ventilation requires no electricity so it s inherently more energy efficient. For balanced ventilation an equal amount of intake vent area net free area should also be installed. A simple passive system uses no energy will work just as well for free as a powered active system and in almost all instances has the benefit of being silent. The most common types of active vents include wind turbines wire powered vents and solar powered vents.

This is because active airflow is more consistent than passive airflow. If oversized negative pressure in the attic can suck conditioned air from the living spaces below. Passive attic vent vs active attic vent my question. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.

Active ventilation products has exhaust roof vents for both flat roofs and pitched roofs. I can install the rotary things i can install a powered roof vent or i can install a solar powered fan vent thing. A vent pipe running from the sub slab of the basement up above the eave line of the roof or in the garage attic sealed and caulked cracks in the foundation there are several ways for an active mitigation system to be installed depending on the layout of the home. Poor attic ventilation can also be a contributing factor in the formation of ice dams in winter.

However this type of active ventilation can do more harm than good if your home has not been properly air sealed. I can install the simple roof louver. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The best way to get air moving in an attic is by using powered vents.

Without some means of ventilation moisture and in summertime heat can accumulate to undesirable levels in the attic space.