Active Vs Passive Attic Ventilation

Active ventilation products has exhaust roof vents for both flat roofs and pitched roofs.

Active vs passive attic ventilation.

However this type of active ventilation can do more harm than good if your home has not been properly air sealed. 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. Passive ventilation requires no electricity so it s inherently more energy efficient. I can install the simple roof louver.

For balanced ventilation an equal amount of intake vent area net free area should also be installed. Since i want to reduce the heat load on the house to limit a c bills i need to install vents in the roof. If oversized negative pressure in the attic can suck conditioned air from the living spaces below. Attic fans and powered attic ventilators pavs can provide active ventilation in attic areas.

Hip roof with not much space vents. Active roof vents will exchange the air inside the attic with fresh air from the outside many times faster than passive vents. Poor attic ventilation can also be a contributing factor in the formation of ice dams in winter. 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.

Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph. Below are pictures of common static roof vents also called passive roof vents and gravity roof vents. This type of ventilation is especially important for. This is because active airflow is more consistent than passive airflow.

The most common types of active vents include wind turbines wire powered vents and solar powered vents. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Choose the style of vent you like and pick the size and height. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans.

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. Any unconditioned attic requires ventilation. Taking advantage of this natural process referred to as passive ventilation.

Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.