Yet Another Filter Question (Sorry!)

Hi everyone! My first post here -- and won't be my last. The next one's won't be questions hopefully, as I have a good head for things (other than this particular subject).

I have been lucky enough to obtain a S&P TD-150 fan from a friend a few months ago. This is a 6" mixvent fan that can operate at either 293cfm OR 218 cfm. For my needs, I'd like to use the 218 setting, as anything above that is very unnecessary for me.

I'm having a tough time finding a compatible filter, however.

I've researched this a good bit, and there are many topics where people talk about the fan and possible carbon filters, but then for whatever reason get distracted and end up getting a different fan or stop posting.

I've seen CANN33 recommended, as well as Can-filter 9000. There are also Phresh Filters, but alas, I'm at a loss for what filter to get. I'm leaning towards Phresh because of their low cost, but I'm unsure of which one to get.

The tent that will use this item has the following dimensions: 20" x 36" x 64". Space isn't too much of an issue so I can either exhaust (push) or suck (scrub) without a problem.

My apologies for asking such a boring question (and one that is often repeated here), but can someone please help me find a compatible filter?

I'm just worried that my fan may end up shooting/sucking air out too fast for the filter, thus rendering it near-useless. On the other hand, I'm also worried that I may end up with a filter that has a high CFM requirement, which would indicate that my fan wouldn't be powerful enough to suck or push. </rant>

Though probably unnecessary for helping to answer the question, here's a good chart indicating the static pressure v CFM



Thanks.

If your looking for quality a can 33 with a 6" flange would be perfect for you. I would reccomend them over phresh because of the quality of steel vs aluminum alloy

Check the Phresh filter website under FAQ where they tell you what size filter is compatible with your CFM. Phresh filters weigh about half as much as Can and they are just as good if not better.

I would think that you cant really go wrong with a bigger filter, the bigger it is the easier your fan will be able to suck or push through it. If you go too small though you will wear your fan very quickly.

Does anyone know if there are fans that can be opened up and have the carbon replaced? I have a 175cfm 4 inch fan. I don't like the idea of having to toss out your filter every year and buy a new one if you could just replace the carbon. My hydro store doesnt have filters like this

The reason you can't do that is because they use factory compressed carbon so they can stuff more carbon in the filter giving it greater filtering power. You can't manually cram that much carbon in, even if you could open the filter up. My Phresh filters last 1/5-2 years.

in my experiance s&p fans dont do so well under pressure have a td 100 but ended up upgrading to a 6"can and phresh filter and use the s&p for intake booster filter just killed the cfm's and labored the fan to the point of overheating plus they have a relatively low excepible operating temp in regardes to pulling heat off of the bulb not a big deal till the heat of summer kicks in and your pulling 100+ deg out of the hood

ahhh so you dont want to run hot air through hoods and then to the filter? good to know never thought of that. Im still in veg on first grow, starting to get a pleasant smell when I open the door to the basement, gotta save up some money quick before its flower time

its worth putting your money in good products or you'll be buying things twice if its something you plan on doing for awail its aways money well spent

sarita99 said:

The reason you can't do that is because they use factory compressed carbon so they can stuff more carbon in the filter giving it greater filtering power. You can't manually cram that much carbon in, even if you could open the filter up. My Phresh filters last 1/5-2 years.

Click to expand...

Thats about what I got on my Can filter with a 6'' can fan.. I get about 3 grows before you can start to tell they are wearing down.

They definitely do make refillable filters, and the non refillable ones can be refilled also. Just drill out the rivets and replace with screws. It would however be messy. It's my understanding that the special machine used in filling the filters is just a shaker of some sort to settle the carbon completely. I heard someone reccomend using the shake of a washing machine to do this job, just set the filter on top of it while its on as you fill, but I would imagine that's only practical with a smaller filter. Too much work and mess imo especially with larger filters, but on a budget its reasonable. Just glancing at prices, it seemed like maybe you could save 50% overall based on the prices of Phresh filters when I was entertaining the idea.

My first filter was actually a 750 CFM 8" x 24 Phresh filter, and its great quality and works great. Recently because of the better pricing I bought a 1050 cfm 10"x36 Phat Filter for my flower room. The Phresh filter was priced $205, and the PhatFilter $244. The Phresh equivilent to this PhatFilter was priced over $400. It is no question somewhat cheaper quality. It's heavier and the metal overlapping connections weren't quite as clean, however it works great. I put actually a smaller fan on this filter with a reducer. It's my understanding that fan with less CFMs with the filter will work, and will extend the life of your filter. It's just a matter if the airflow is enough to clear the room. In late veg early flower, in a 12x12x10 room, this filter is doing the job perfectly with just an 8" fan and a reducer recirculating room air, no ducting in our out of the room. I have not yet created negative pressure in the room, and imagine if the smells pick up doing so will fix any future issues smell issues if they even happen. Since I have the higher CFM filter, upgrading my fan is also an option.

I've heard mixed reviews regarding the life of these filters anywhere from 9-24 months. The guy who sold me the bigger filter threw out the number of extending a normal life of 24 months to 48 months on my big filter since I got it oversized for my room with a smaller fan. Would be amazing, but I've not holding my breath.

Thedillestpickle said:

I would think that you cant really go wrong with a bigger filter, the bigger it is the easier your fan will be able to suck or push through it. If you go too small though you will wear your fan very quickly.

Does anyone know if there are fans that can be opened up and have the carbon replaced? I have a 175cfm 4 inch fan. I don't like the idea of having to toss out your filter every year and buy a new one if you could just replace the carbon. My hydro store doesnt have filters like this

Click to expand...

whitefrost said:

in my experiance s&p fans dont do so well under pressure have a td 100 but ended up upgrading to a 6"can and phresh filter and use the s&p for intake booster filter just killed the cfm's and labored the fan to the point of overheating plus they have a relatively low excepible operating temp in regardes to pulling heat off of the bulb not a big deal till the heat of summer kicks in and your pulling 100+ deg out of the hood

Click to expand...

That's unfortunate. I heard both good and bad things about the S&P line of fans and was hoping that this particular model would do fine at venting/filtering. I'm hoping the increased power in comparison to the TD-100 will help.

That's partially why I'm a bit iffy on what model of filter to get. I'd need one that wouldn't cause problems with the fan, but also allow it to do its job perfectly.

dont get me wrong it works great at static and ive used it for going on 4 years its a quality fan i use mine on a lower intake blowing on my ballast i hope it works out for you i was just sharing my experiance i would suggest a filter with a high air flow rating it can be done.

and i bought it used for 30 bucks god knows how old it is

Thanks for the input!