UV Light For HVAC - Page 2
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  1. #14
    Join Date
    May 2004
    south louisiana
    new construction duct/return leakage to 5%
    existing is harder..less access to some areas, but 10% average on existing duct/return.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  2. #15
    Join Date
    Mar 2013
    CoolerGuy, beware of the claims of the REME. The test protocol related to the bacteria disinfection involved the inoculation of stainless steel coupons which were placed inside a controlled 3' x 3' atmosphere chamber equipped with an ozone producing lamp or Phi cell as they call it. And the fact that people believe this product reduces particulate is a complete farce. Unless you believe charged particles will avoid every other piece of furniture in your home and travel directly to the media cleaner to be collected. A great filter, a UVC light at the coil, and a means to reduce odors without ozone, using charcoal filters or some other method, is the best way to help control contaminates in a home.

  3. #16
    Join Date
    Aug 2012
    Gainesville, FL
    Quote Originally Posted by ComfortService View Post
    We tried a duct cleaning along with a UV light but after 3 months the problem got better but didn't go away. Eventually we had to replace the unit and ductwork to eliminate the mold permanently.
    Did you treat with any of the micro-biocides on the market? Complete replacement seems... extreme? I understand replacing pervious ductwork, but usually hard surfaces can be treated

  4. #17
    Join Date
    Feb 2013
    Summerville SC
    im am not a big fan of uv lights because as you can see in the picture they will only keep clean what its shining on. Ive seen where they actually keep coils mold free but what about all that duct work on both sides of the light......mold. If you have a customer that has bad allergies or whatever the case that they seek a uv light. I would refer them to new duct work or duct cleaning. I have never sold one to a customer just because the fact that I don't want to stand behind a upgrade that I truly don't stand behind. that's just my 2 cents though. Also most customers aren't going to like it when they find out that the bulb needs to be changed annually(in most cases) and they aren't cheap.

  5. #18
    Join Date
    Jul 2011
    I'm not an expert on IAQ. But what our company recommends when there is a bad case of fungal growth is a duct cleaning(includes blower and evap coil), upgrading filtration to electronic or Merv 16 whole house filter and installing UV or UV/ozone air purifier. I've been told that a lot of the lights aren't strong enough to sterilize anything but what its shining on. But some of the newer lights on the market with a higher micro watt intensity are actually capable of sterilizing airborne bacteria/viruses. Especially if you have a long return and can mount them in the middle of the return so the light is shining on the air as soon as it enters the return. All the way to the light, and then all the way from the light till it gets to the furnace/air handler. I've heard great things about the ozone bulbs ability to get rid of odors. I have one customer that smokes constantly in her house. We put the UV/ozone combo in for her a while back and I came back to her house the other day. It didn't smell amazing but if I didn't know, I probably wouldn't guess the house was smoked in...

  6. #19
    Join Date
    Jul 2011
    Sacramento, CA
    We just started stocking the Air Scrubber Plus made by activtek. All the research is very convincing, but I'm doing my own right now before I reccomend one to anybody.

  7. #20
    UV lights have been in use for decades. The first scientific tests were performed on b-coli in 1935. This is not really new tecnology. It is just the way that UV lights have been marketed is the problem. For example, I won't name a manufacturer but here is tidbit of a phone conversation with a manufacturer that I called last week. I called them regarding their claim of having the most powerful UV light on the market. This particular UV light was of the "stick light" type. I called their tech support to find out more information regarding their claim. I was told that there was no real test procedure that anyone uses to determine UV intenisity. The answer I got was "at the lamp I could be 30K microwats at the lamp and 10" away I could be 1K microwatts. There is just no definite answer for their claim as being the "most powerful light on the market." I also wanted to know where to install this light. On the box it showed a schematic of a furnace with plenum and return air drop. It showed multiple installation locations for this light. The one I was worried about was the notation that it could be installed in the return air drop. The tech told me no, do not install it in the return drop and that this particular light needs to be installed over the a-coil. He began to tell me of their other product to use in the return air drop

    This is what is wrong with the UV marketplace. If we used UV lights in their proper application, we would all be better off. A "stick light" is meant to be an object purifier. It is not an air purifier!!! It slays me everytime I pick up a manufacturers little brochure and it shows biological contaminants flowing across a stick light and clean contaminant free air above. The stick lights are too weak and air is moving way too fast to do any damage. You may get lucky and have a mold spore or virus land on the lamp and eventuall it will die. When is the last time you installed a stick light in a return duct and got a referrel from them? Here is a link to UV dosage table to inactivate/kill different contaminants. I am not sure what the most powerful stick light rating is in the marketplace. http://www.americanairandwater.com/u.../uv-dosage.htm You can purchase a Lennox System in either 1500 microwatt or 2000 microwatt. Look at the table and see what 2000 microwatt kills. I didn't see anything on there. Did you? Also check and see what lamp replacements cost and frequency of replacement. Those dollars can add up.

    I am particular to Sanuvox. Sanuvox markets their product how they should be marketed. When you purchase a Saber light, it is an object purifier. When you purchase an R+, it is an air purifier. The R+ is rated at 16000 microwatts of UV energy produced. Look back at that list and see what damage 16,000 microwatts can do on those contaminants. Theres a lot on that list that are killed on a 99% basis first pass. It is also very simple to install in return air drop, and has a 3 year lamp life. Seeing 3.5 to 4 years is not uncommon with these either as they are rated on run time. They will turn themselves on and off when the fan cycles off and on. The replacement lamps are also reasonably priced. No periodic maitenance either. Sanuvox also has the S300 which incorporates HEPA filtration and UV to get the best of both worlds and the P900 portable unit rated at 900 sq ft of air purification. They also offer an extensive commercial offering that can't be beat.

    When considering a UV light manufacturer, do your research. Call and talk to them. As in my phone conversation above, you can print anything you want but when you talk to someone the truth comes out. Find a trusted manufactuer and a little change in the way you market these UV lights to the end user can drastically improve your UV sales and your bottom line. How many overflowing drain pans can you resolve this year?

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