![]() ![]() ![]() If there is too little throw, the hot air will stop moving partway across the room, the cold air from the window will not be heated (creating the feeling of a cool draft), and air circulation will suffer. However, the hot air must be pushed from the register with enough force (or "throw") so that it will cross the room and reach the window. The hot air from the register will mix with the cold air coming off the window, cool, and drop to the floor-creating good air circulation. Generally, the heating register will be directly across from an exterior window. The correct placement of wall heating registers is critical. When a floor register is not practical or desired, a wall register is used. It is rare to find a floor register installed less than 6 inches (15 cm) from the corner of a room. Floor registers generally have a grille strong enough for a human being to walk on without damaging the grille. This creates good air circulation in a room, and helps to maintain a more even temperature as hot and cold air is mixed more thoroughly. This is because hot air rises, and as it cools it falls. įor heating purposes, a floor register is preferred. In such cases, heating most often takes precedence over cooling, and registers are usually found close to the floor. In practice, cost considerations usually require that heating and cooling be provided by the same register. Ideally, a room will have both heating and cooling registers. If not properly installed and tightly connected to the ductwork, air will spill around the register and greatly reduce the HVAC system's efficiency. Registers are a critical part of the HVAC system. (Higher ambient levels of background noise, such as those in restaurants, allow higher air velocities.) On the other hand, air velocity must be high enough to achieve the desired temperature. The velocity of air through a register is usually kept low enough so that it is masked by background noise. This can create rushing sounds which can disturb occupants or interfere with conversation or work (such as sound recording). If a register is too small, the HVAC system will need to push air through the ducts at a faster rate in order to achieve the desired heating or cooling. Registers vary in size with the heating and cooling requirements of the room. Īn unlouvered wall register, which allows circulation of air from one floor to another. HVAC systems generally have one register and one return per room. ![]() Generally, in rooms where it is critical to maintain a constant temperature two registers (one placed near the ceiling to deliver cold air, and one placed in the floor to deliver hot air) and two returns (one high, one low) will be used. In contrast, returns (grilled ducts which suck air back into the HVAC system for heating or cooling) are usually placed in the wall or ceiling nearest the center of the building. Usually, a register is placed near a window or door, which is where the greatest heat/cooling loss occurs. Placement of registers is key in creating an efficient HVAC system. However, in practice, the terms "grille", "register", and "return" are often used interchangeably, and care must be taken to determine the meaning of the term used. A register differs from a grille in that a damper is included. Grilles sometimes have louvers which allow the flow of air to be directed. Register dampers are also important, and can serve a safety function.Ī grille is a perforated cover for an air duct (used for heating, cooling, or ventilation, or a combination thereof). The placement and size of registers is critical to HVAC efficiency. A register is a grille with moving parts, capable of being opened and closed and the air flow directed, which is part of a building's heating, ventilation, and air conditioning (HVAC) system. ![]()
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