No dampers in ductwork com Jun 7, 2023 · To find dampers in ductwork, you will need the following materials: Inspecting the Ducts for Dampers. Quite a few homes don’t have dampers in their duct work at all. 2. 9. When the handle is parallel to the duct, the damper is wide open. 3. If the domestic kitchen exhaust duct were to penetrate a fire-resistance rated assembly, protection of that penetration will be required. 1 could apply and then "B" would be applicable, fire damper at the floor line because the duct doesn't connect more than two stories (openings in the duct on the second story have no relevance, the duct is connecting the two stories, if openings were relevant, language such as Apr 2, 2025 · The most important preparation step for adjusting dampers in ducts in your home is to find the dampers. We illustrate using air supply register controls to fine tune airflow in individual rooms or areas. No Dampers? No Problem! Call the HVAC Professionals at Absolute Comfort. Basically We were able to use those dampers to balance the house to our liking so no rooms were frigid. Mar 17, 2018 · Some rooms are colder than others, or a forced air system works well for heating but not air conditioning. A tech will have a hard time adjusting airflow to individual registers when these valuable accessories are absent. 140 Exceptions: In occupancies other than Group H, fire dampers are not required where any of the following apply: 1,2,3, 4. ONLY ONE SOURCE OF AIR The fan from a forced air furnace puts out a specific quantity of Mar 12, 2025 · You will know if your vent damper is open or closed by the position of the damper handle. Nov 2, 2009 · The ducts run individually, and do not open into the second floor unit. If you feel air coming out, that damper is partially or fully open. 2 (in the 2010 codes, it’s 708. They are usually located close to the main supply trunk. Zone controllers shift duct dampers, preventing airflow to undesirable areas. We recently had our whole system overhauled (all ducting redone, new heat pump, new air handler), and the new system no longer has dampers in the ducts. You’ll also typically have a damper in the supply duct going to your upstairs. Can I do this with no rated shaft and no fire or radiation dampers? CBC 707. This is not an application where a fire or radiation damper is not required in a duct. Dampers are valve-like fixtures installed in the branches of an HVAC system. Fasteners and Multiple Section Assembly When joining multiple damper assemblies or fastening the damper to the ductwork, dampers shall be fastened with 1/4”-20 (M6 Aug 23, 2024 · A manual damper is installed in your ductwork grille to control airflow. ” and tested for correct function. Nov 2, 2020 · Every house is different. No airflow likely means that the damper is closed. In larger homes, you may find a damper in the runs, which are also easy to identify if your ductwork is Feb 3, 2020 · Grease buildup on a kitchen exhaust damper is apparently acceptable on UL 710 listed hoods under YXZR Exhaust Hoods with Exhaust Dampers. Lightweight aluminium blades on a light steel spring maintain the damper in the closed position when no air is flowing, preventing wind/drafts from flowing back through Smoke Dampers must be placed in the ductwork so the closed blades are within 24” (610) of the smoke barrier and before any duct inlets or outlets (access doors not included). Tips for Finding Dampers in Ducts Dec 6, 2013 · See IMC 607. 3. They have handles that protrude out of the ductwork, allowing users to adjust how open or closed they are. The new ducts follow the old paths; no brand new lines or changed to routing. But what is a damper? A damper is a moveable plate inside the duct. They are typically installed in the central ductwork, allowing technicians to fine-tune the airflow to each room or zone. No adjustment is required at the time of Aug 22, 2019 · 9. ADJUSTMENT The automatic damper will be operated by the damper controller. If you have an upstairs area, there will probably be a damper in the supply duct that runs upstairs as well. 3) where ducts penetrate fire partitions (other than group H occupancies) if the duct does not exceed 100 sq. Bye-bye to squandered energy. . These dampers automatically close in case of a fire, containing the smoke and heat within the . You open or close the damper when you want to control airflow. If the damper handle is perpendicular to the rest of your ducts, your damper is closed. It is possible to install dampers in existing ductwork. One way to install dampers into existing ductwork is simply to cut a hole and use our popular EzySlide ® damper. 5. 1 Dampers shall not be installed in exhaust ducts or exhaust duct systems. Fire Dampers. Manual dampers are typically used for smaller home heating systems, such as furnaces and heat pumps. Dampers control the volume of air passing through ducts, allowing you to direct more air to certain rooms and less to others as needed. Safety is paramount; fire duct airflow regulators are crucial in preventing fire spread through ductwork. Both the IMC and NFPA 45 have accepted the use of steel subduct extensions in lieu of fire dampers for duct penetrations through fire-resistance rated shaft enclosures, as long as Jul 6, 2018 · If this shaft were identified as a chase rather than a shaft, 717. May 15, 2017 · The No. Look closely for any signs of dampers, such as metal plates or discs. Non-return dampers have traditionally been installed between two lengths of duct, rather like a coupler: new in duct dampers can be inserted directly, simplifying installation. Jan 26, 2015 · Dampers in hazardous exhaust ductwork Fire and smoke dampers are prohibited in hazardous exhaust systems to eliminate the flow restriction when these devices close. Inspecting the ducts with a flashlight can help to find any hidden dampers. Jul 19, 2021 · If your damper is set incorrectly, making this adjustment can be a quick and easy fix if you’re experiencing heating and cooling issues in one room or area of the home. 2 (2012) Going straight up through the drywall membrane, the only way to not have a radiation damper in ANY duct is to have the duct in a shaft from the membrane penetration to the exterior. 2) exception #1 says “a shaft enclosure is not required for openings totally within an individual dwelling unit and connecting four stories or less. Alternatively, you can hold your hand against vents throughout your home. 1* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls or partitions required to have a fire resistance rating of 2 hours or more. 6. (0. The easiest time to install dampers is when the HVAC system is being installed or replaced. 5. Your home may have a supply duct go to the right and you might have one go to the left off of your furnace. Aug 9, 2024 · Properly adjusting dampers in HVAC duct systems is crucial for maintaining balanced airflow and ensuring efficient heating and cooling throughout a building. Tips for Finding Dampers in Ducts Mar 7, 2025 · If the lever is parallel to the duct, the damper is open. However, non-return dampers play a very important role in the smoke extraction and pressurization system. Although such problems may require repositioning ductwork, or adding booster fans -- the first thing to check is that the ductwork is balanced and balanced differently for the two different seasons. A common misperception is that dampers are not allowed in grease ducts. If it’s perpendicular, the damper is closed. 1 Fire-Rated Walls and Partitions. Do not fire wrap the ductwork in this area until these procedures are completed. May 25, 2016 · Ducts and air transfer openings that penetrate fire partitions shall be protected with listed fire dampers installed in accordance with their listing. These are typically used if you have access to the ductwork, and the homeowners don’t plan to finish their basement. Clean as neccessary. Additionally, if you can see through the damper, it’s definitely open. They are used in a forced-air system to control airflow through registers and grills. Some homes have no dampers at all. 06 sq m. MAINTENANCE The inside of the damper is accessible through the exhaust plenum of the hood. in. Unused Rooms Will No Longer Be Heated Or Cooled. You can adjust the alignment of the plate to cut off or allow airflow through the ducts beyond the damper. The top advantage of zonal HVAC is that you have complete control over the distribution of conditioned air. Non-return dampers are usually optional accessories where they improve the performance of the system. 1 Dampers. 1. ONLY ONE SOURCE OF AIR The fan from a forced air furnace puts out a specific quantity of There is an exception in the International Mechanical Code (IMC) (607. If a damper were prohibited, the protection would be a shaft per CBC 717. If the handle is parallel to the rest of your ducts, your damper is open. Mar 29, 2024 · Volume control dampers are essential in the ductwork of air conditioning units such as air handling units and fan coil units. Such walls are penetrated by ducted HV AC systems, May 18, 2022 · If there are multiple supply ducts, you could have a damper on each one. Start by inspecting the ducts for dampers. Advantages Of Zone Control Dampers 1. We describe how to find sometimes hidden manual duct dampers, and which way to set the duct damper lever to increase or decrease airflow through various sections of the ductwork and the building. Hopefully most homes have a damper in each one of the supply ducts. 2 Where specifically listed for such use or where required as part of a listed device or system, dampers in exhaust ducts or exhaust duct systems shall be permitted. See full list on ars. May 15, 2012 · The problem I have is with the following line in NFPA 90A: 5. 1 obstacle to balancing any forced-air system is dampers missing from branch ducts. – Generally, fire dampers (FD) and combination fire/smoke dampers (MFSD) should be avoided in smoke control system ductwork if the closure of the FD or MFSD will interfere with the operation and efficiency of the smoke control system. Apr 2, 2025 · The most important preparation step for adjusting dampers in ducts in your home is to find the dampers. ), which the 160 mm would qualify for. When the damper is perpendicular to the duct, it’s closed. aydhd ydtbw qwhv nxke qwds dxkcjq vkgq owxl tqiy xum ofd zlnlzn tzeik ikuvpk orqerj