Single Slot Ac Grill

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• Single Slot Ac Grille
• Single Slot Ac Grilles

Noisy registers and grilles are annoying to your customers. When they express this concern to you, what can you do to correct the situation? Let’s take a look at the top five sound-reducing options available to you.

How Loud is Too Loud?
A register or grille is too loud whenever your customer says it is. This is an opportunity to meet your customers desires and earn additional income.

Noise Criteria (NC) rates the sound levels of registers and grilles. This measurement is simply defined as the grille or registers sound, measured in decibels (or dB) minus 10 decibels. Most residential grilles and registers are rated at 20-30 NC.

You can measure NC using an inexpensive sound meter costing less than $100. To measure, turn on the system, measure its dB, then subtract 10 dB. Compare your result to acceptable grille noise levels between 20-30 NC.

Linear Slot Internal Grille The sleek looking Linear Slot internal exhaust grilles have been designed to suite the modern and contemporary bathroom, ensuite or toilet. They come with a 150mm duct connection and are available in single and dual slot.

To measure Noise Criteria, turn on the system, measure its dB, then subtract 10 dB. Compare your result to acceptable grille noise levels between 20-30 NC.

Example: Your customer mentions an annoying sound in the entertainment room. It’s so loud, they must turn up the volume whenever the HVAC system comes on. With the room quiet, turn on the system. Using a sound meter, you measure register noise at 52 dB. Next, calculate the NC Rating (52 dB – 10 dB = 42 NC.) 42 NC is twice the noise level of a quiet register and 50% noisier than the highest acceptable NC rating.

Identify and Solve Noise Problems
Because many customers are used to their noisy systems, they benefit from you asking about the problem.

Ask questions like, “Which room is the noisiest,” and you’ll receive more noise reduction opportunities than ever before. Here are some common airflow noise causes and typical solutions you can offer.

Excessive Airflow
The most common cause of grille and register noise is excessive airflow. A study of grille and register specifications verifies that noise levels increase as more air moves through a grille or register.

The Solution –You have two options. If the airflow into the room is excessive, you can reduce the airflow through the grille or increase the size of the duct and register.

If the room has too much airflow compared to what is required, install a balancing damper at least five duct diameters before the register. Close the damper until the required amount of air is delivered into the room. Test to verify delivered airflow and noise reduction.

If the room has less airflow than needed and is noisy, usually this means the register or grille may be undersized. Increase the grille or duct size to match required room airflow.

If the room has less airflow than needed and is noisy, usually this means the register or grille may be undersized. Increase the grille or duct size to match required room airflow. In this situation, you kill two birds with one stone: you increase airflow and decrease system noise.

Restrictive Registers
Supply registers must meet various airflow applications in the field. For example, some are designed to throw air longer distances than others. These registers have louvers close together to increase air speed. This also increases the air delivery noise and resistance to airflow.

The solution - If noisy, these registers should be replaced with ones sized for quieter operation. This may require replacing the sheet metal boot behind the register also.

You can also add another duct, boot, and register off the trunk duct to relieve airflow from the existing register.

When replacing registers, you’ll find them painted over. As a result, they may be stuck to the ceiling or wall. Be sure to use a razor knife to cut the paint at the register edge before removing it. If not, you may have to eat the cost of repainting the ceiling.

Restrictive Grilles
Return grilles and return ducts are frequently undersized. This causes high velocity noise at the grille and in the duct.

The solution - Because most are undersized, installing an additional return duct in another area of the building is usually your best option. This will also solve the problem of low system airflow by reducing total external static pressure. Search for a duct path into another room or hallway. Be sure to approve the location with the owner first.

If access through the building prohibits installing an additional return duct, inspect to see if you can upsize the return grille near the equipment. Often return noise is caused by air-moving equipment located in a hallway, and where the return duct system is an open building cavity with a return grille screwed to it. If there is no other access, you may be able to cut in another grille in the back or side of the return cavity.

Some return grille noise is caused by the filters used. Replace the filter with a less restrictive one to do the trick. If all else fails, you can reduce noise by increasing the return grille’s open area. Use two needle nose pliers and adjust the louvers to a more open position. This reduces noise and increases airflow.

Face Dampers
Air volume dampers installed just behind the register or grille often cause extreme air noise.

If the grille is installed close to the fan, a damper may need to be closed to direct air farther from the fan. This may cause the damper to scream.

The solution - Remove the face damper installed near the register or grille and replace it with an inline air volume damper in the duct. Install it far enough away to deaden any air noise through the grille.

Of course, there are many other causes to airflow noise such as a tight elbow concentrating the air velocity on one area of the register. A rattling noise can be caused by debris left in the duct, by a loose damper, or by flapping duct liner. Each of these have their own custom solution.

Now that you’re aware of grille noise causes and solutions, bring these opportunities and their solutions to your customers who need peace and quiet.

Rob “Doc” Falke serves the industry as president of National Comfort Institute, Inc., an HVAC-based training company and membership organization. If you're an HVAC contractor or technician interested in a free table showing Noise Criteria levels for different room types, contact Doc at robf@ncihvac.com or call him at 800-633-7058. Go to NCI’s website at nationalcomfortinstitute.com for free information, articles, and downloads.

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Single / Double Deflection Supply Air Grilles

Single / Double deflection supply air grilles manufactured of extruded type 50S anodizing grade aluminium with individually adjustable front vertical and rear horizontal louvres held in place by star lock washers and spring wire.

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Streemline - Fixed Blade

These ceiling grills remain flush and easy to install. Louvered biscuits are moulded in one piece and the pitch of the blades is fixed. Each biscuit can be located to blow in any one of four directions. The grill is manufactured from white ABS plastic. Ideal for commercial, refrigerated air conditioning,heating and ventilation applications.

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Streemline - Adjustable Blade

These ceiling grills remain flush and easy to install. The louvered biscuits can be adjusted to seven optimum set points using the patented locking system. Each biscuit can be located to blow in any one of four directions. Adjustable blade diffusers allows for airflow adjustments after installation. The grill is manufactured from white ABS plastic. Ideal for commercial, refrigerated air conditioning,heating and ventilation applications.

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EGG Crate Grille

These grills are designed to fit in a standard commercial 'T bar' ceiling grid. Available in both aluminium and plastic. Eggcrate grilles and are easy to remove and clean. Ideal for commercial, refrigerated air conditioning,heating and ventilation applications.

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Baby Linear Grille

One piece moulding of the diffuser eliminates joins is scratch resistant and will not corrode or deteriorate with age. Significantly lower cost than aluminium diffusers. These grills will fit commercial ceiling grids and are paintable. The diffuser is moulded from white ABS plastic. Ideal for light commercial reverse cycle air conditioning systems. Suitable for ceiling, commercial T-Bar, bulkhead, and walls.

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Plastic Eggcrate Grille

These grills are designed to fit in a standard commercial 'T bar' ceiling grid. The plastic Eggcrate biscuits are moulded in one piece and can be removed and washed. Fixed blade Streemline Eggcrate grilles are less expensive than aluminium Eggcrate grilles and are easy to remove and clean. Ideal for commercial, refrigerated air conditioning,heating and ventilation applications.

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Linear Elite Diffuser

One piece moulding of the diffuser eliminates joins is scratch resistant and will not corrode or deteriorate with age. Two 25 mm slots provide high flow rates with low noise levels and enables 180 degree throw pattern. Significantly lower cost than aluminium diffusers. The diffuser is moulded from white ABS plastic. Ideal for reverse cycle air conditioning systems.

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Airline Diffuser

A stylishly presented 4 slot linear grille made with one piece moulding. It is scratch resistant, and will not corrode. It is suitable for airflow of up to 220 l/s with 360 degree direct able airflow. Best used for commercial Reverse Cycle Air-conditioning systems.

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Weather Louver Type WPL

Weather Louvre manufactured from anodizing aluminium. Sizes and Blade spacing vary according to louver size and requirements.

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Opposed Blade Dampers

Opposed Blade Dampers suit all standard grilles and diffusers. The blades are linked and lever or slot operated. They are manufactured from extruded aluminium Blades which are held in place by spring wire and star lock push on fix.

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Plastic Grilles

Door Grille

Door Grilles are manufactured complete with or without telescopic back frame of extruded anodizing aluminium. These grilles have fixed horizontal Chevron Louvres.

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Return Air Grille / Return Air Grille With Filter Frame

Single Slot Ac Grilles

Return air grilles manufactured from aluminium, powder coated. Comes with a return filter and frame with wire mesh screen.

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