I just wanted to add my 2 cents on this thread and talk a bit about noise control.
One of the most frequent complaints I have seen while lurking around the 'nets is fan noise, and it is probably one of the more basic problems to overcome. A cheap grow room can be a very noisy grow room, and noise control goes hand in hand with odor control. Of course, buying a good fan in the first place goes a long way, but short of replacing the fan you already bought, what can you do??
Noise in your fan and ventilation system is caused by vibration from many sources. A metal fan has a natural harmonic vibration that it creates simply by running. Metal ducting can easily vibrate in an air flow and being stiff sets up eddy currents and points of resistance in the air ducting that make more noise. The flow of air in a duct makes noise, but you can do things to reduce it.
Quieting a fan can be tricky, but with a bit of work you will be amazed at what you can do with some basic materials and a little time.
The Navy has been quieting submarines for decades by using some complex but basic techniques. Machinery inside the hull that makes noise is mounted on "rafts" with large rubber bearing mounts that prevent vibration from being carried to the hull. The outside of a submarine is covered with "anechoic tiles" that are basically special rubber tiles that are glued over the entire hull to prevent vibrations being transmitted into the water. That technology is not difficult to mimic.
My local hardware store sells heavy rubber sheet in different thicknesses by the pound. They are reinforced rubber sheet trimmings from different places, but they all make outstanding vibration and sound isolation mounts.
Simply, take a properly sized heavy rubber strap, 1/4" or so thick depending on what you can find, and mount your fan to it, and then mount the strap to your support framing in the grow room. The rubber will not transmit any vibration, and it will cut down the noise significantly all by itself. People already do a version of this by using bungee cords to hang the fan. This technique is more permanent and much more secure.
Next, take some of that same rubber material, 1/4" thick, and cut pieces that are shaped to fit together on your fan, and use contact cement to glue them tightly to the entire outside of the fan housing. The rubber will absorb most, if not all, of the natural vibration the fan creates while running, and thereby reduces the sound as well. You can even add a layer of fiberglass over the top and tape it on with duct tape. Leave the electrical box accessible, but otherwise, cocoon the entire fan. (Fans are air-cooled from the inside)
Metal ducting should be insulated, but it is still quite noisy no matter what you do to it. Better yet, use insulated, plastic lined residential air conditioning duct. It comes in various lengths and is designed to provide a smooth passage for air and reduce the flow noise in home air recirculating systems as much as possible.
CAUTION: DO NOT CONNECT PLASTIC DUCTING DIRECTLY TO YOUR GROW LIGHTS!!! IT WILL CATCH FIRE!!
Lastly, plain old Pink Panther insulation in the walls, under the floor, and in the ceiling of your grow room will go a long way toward controlling the noise your grow emits as well as the temperature inside.
Keep in mind that there are people in your neighborhood who would complain if you hung 'em with a new rope, so anything you can do to keep them from sticking their nose in your business is a good thing. Noise complaints will get you busted as fast as an uncontrolled grow room aroma, so it is worth your while to do whatever you can to reduce your risks.
I do understand doing things on the cheap, but for those who have a noise problem a bit of work to improve what you already have can go a long, long way. If you are in a residential neighborhood, the less noise your grow makes, the better.
Be careful out there.
One of the most frequent complaints I have seen while lurking around the 'nets is fan noise, and it is probably one of the more basic problems to overcome. A cheap grow room can be a very noisy grow room, and noise control goes hand in hand with odor control. Of course, buying a good fan in the first place goes a long way, but short of replacing the fan you already bought, what can you do??
Noise in your fan and ventilation system is caused by vibration from many sources. A metal fan has a natural harmonic vibration that it creates simply by running. Metal ducting can easily vibrate in an air flow and being stiff sets up eddy currents and points of resistance in the air ducting that make more noise. The flow of air in a duct makes noise, but you can do things to reduce it.
Quieting a fan can be tricky, but with a bit of work you will be amazed at what you can do with some basic materials and a little time.
The Navy has been quieting submarines for decades by using some complex but basic techniques. Machinery inside the hull that makes noise is mounted on "rafts" with large rubber bearing mounts that prevent vibration from being carried to the hull. The outside of a submarine is covered with "anechoic tiles" that are basically special rubber tiles that are glued over the entire hull to prevent vibrations being transmitted into the water. That technology is not difficult to mimic.
My local hardware store sells heavy rubber sheet in different thicknesses by the pound. They are reinforced rubber sheet trimmings from different places, but they all make outstanding vibration and sound isolation mounts.
Simply, take a properly sized heavy rubber strap, 1/4" or so thick depending on what you can find, and mount your fan to it, and then mount the strap to your support framing in the grow room. The rubber will not transmit any vibration, and it will cut down the noise significantly all by itself. People already do a version of this by using bungee cords to hang the fan. This technique is more permanent and much more secure.
Next, take some of that same rubber material, 1/4" thick, and cut pieces that are shaped to fit together on your fan, and use contact cement to glue them tightly to the entire outside of the fan housing. The rubber will absorb most, if not all, of the natural vibration the fan creates while running, and thereby reduces the sound as well. You can even add a layer of fiberglass over the top and tape it on with duct tape. Leave the electrical box accessible, but otherwise, cocoon the entire fan. (Fans are air-cooled from the inside)
Metal ducting should be insulated, but it is still quite noisy no matter what you do to it. Better yet, use insulated, plastic lined residential air conditioning duct. It comes in various lengths and is designed to provide a smooth passage for air and reduce the flow noise in home air recirculating systems as much as possible.
CAUTION: DO NOT CONNECT PLASTIC DUCTING DIRECTLY TO YOUR GROW LIGHTS!!! IT WILL CATCH FIRE!!
Lastly, plain old Pink Panther insulation in the walls, under the floor, and in the ceiling of your grow room will go a long way toward controlling the noise your grow emits as well as the temperature inside.
Keep in mind that there are people in your neighborhood who would complain if you hung 'em with a new rope, so anything you can do to keep them from sticking their nose in your business is a good thing. Noise complaints will get you busted as fast as an uncontrolled grow room aroma, so it is worth your while to do whatever you can to reduce your risks.
I do understand doing things on the cheap, but for those who have a noise problem a bit of work to improve what you already have can go a long, long way. If you are in a residential neighborhood, the less noise your grow makes, the better.
Be careful out there.