Air Extract or Supply Valves

Ventilation valves are an essential part of any HVAC (heating, ventilation, and air conditioning) system

These valves help to regulate the flow of air in and out of a building, providing fresh air and removing stale or polluted air. In this article, we will discuss both intake and extract valves, their functions, and the different types available.

Intake Supply Valves:

Intake valves are responsible for bringing fresh air into a building. They work by drawing in air from the outside and filtering it before distributing it throughout the building. The primary function of intake valves is to improve indoor air quality by increasing the amount of fresh air in a building.

There are several types of intake valves available, including:

  1. Gravity intake valves: These valves work by allowing air to enter a building through a duct or grille located in the wall or roof. The design of gravity intake valves relies on the natural movement of air due to temperature and pressure differences between the inside and outside of the building. They are typically used in small spaces where airflow is not a major concern.

  2. Mechanical intake valves: These valves use fans or blowers to force air into a building. They are often used in larger buildings where a higher volume of fresh air is required. Mechanical intake valves can be controlled using various methods, including timers, thermostats, and carbon dioxide sensors, to ensure optimal performance.

  3. Energy recovery intake valves: These valves work by recovering energy from the stale air that is being expelled from a building and using it to preheat or cool the fresh air being brought in. Energy recovery intake valves are an excellent choice for energy-efficient buildings, as they can significantly reduce heating and cooling costs.

Extract Valves:

Extract valves are responsible for removing stale or polluted air from a building. They work by drawing air out of the building through a duct or grille and expelling it to the outside. The primary function of extract valves is to improve indoor air quality by removing pollutants and excess moisture.

There are several types of extract valves available, including:

  1. Gravity extract valves: These valves work by allowing air to exit a building through a duct or grille located in the wall or roof. The design of gravity extract valves relies on the natural movement of air due to temperature and pressure differences between the inside and outside of the building. They are typically used in small spaces where airflow is not a major concern.

  2. Mechanical extract valves: These valves use fans or blowers to force air out of a building. They are often used in larger buildings where a higher volume of stale air needs to be removed. Mechanical extract valves can be controlled using various methods, including timers, thermostats, and carbon dioxide sensors, to ensure optimal performance.

  3. Heat recovery extract valves: These valves work by recovering heat from the stale air that is being expelled from a building and using it to preheat the fresh air being brought in. Heat recovery extract valves are an excellent choice for energy-efficient buildings, as they can significantly reduce heating costs.

In conclusion, ventilation valves play a crucial role in regulating the flow of air in and out of a building. Intake valves bring fresh air into the building, while extract valves remove stale or polluted air. By using the appropriate type of intake and extract valve, building owners can ensure that their indoor air quality is healthy and safe for occupants. Additionally, the use of energy recovery and heat recovery valves can significantly reduce heating and cooling costs, making them an excellent choice for energy-efficient buildings.

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