Search:

No hard feelings here Artrose because I believe in speaking out when people don't agree. I respect you and your opinions and that isn't going to change. We are not that far apart anyway. What almost...

When doing the original balance BBeerme the system probably worked because the fitting most likely didn't have enough grease in it to screw up the works. I'll bet that one drove everyone crazy. They...

There is no excuse for shoddy work and that includes maintenance. In the 25 years I did TAB all too often I was called in to balance a facility that was "ready to balance" only to find VAV's that had...

What a balancer hates is to fire up a VAV only to find out it doesn't respond. Balancers don't fix those problems. Unless you are going to pay the balancer to trouble shoot the facility separately...

A good balancer will find the problems for you. Given that you should find and fix the problems you can find.

Welcome oldschool1. This is an amazing site.

The purpose of leak testing buildings is to prevent the waste of energy used to maintain building comfort. In spite of what some here seem to think there are established parameters for leakage. Total...

I have a Mathcad program full of calculations like this. Infiltration has to be treated like makeup air because that's what it is one way or another. That simply means you use direct ambient...

Give us calculations to back up your post #73. Assume there is 400 CFM of infiltration at CFM75that is bogus. With outdoor conditions of 95F@45%RH how much cooling is that?

The way I understood BBeerme is that a few hundred CFM does matter. Calculate the amount of cooling it takes to cool air down from 95F @ 45% RH and it will make more sense. Air infiltrating a...

Let's take a residential kitchen exhaust hood for an example. The damper on them is almost always a backdraft damper. The exhaust fan normally develops about 0.1 inch of static to move the air. If...

I did strike out on my own and hated the paper work. I actually enjoyed the paper work associated with design work but hated the business type paper work. My secretary enjoyed the book work so I let...

BBeerme ask some good questions in post#45. Why haven't they been answered?

Judging by the way this thread has gone I don't expect many good answers. This is a great site but the weakest area I...

When you run the tests let us know the result and how you ran the test under both positive and negative pressure. As usual BBeerme brought up some great points. I think I know what he's driving at....

Your points are well taken Artrose but the truth to a university on this subject would result in ??????????!!!!!!!!

Commercial jobs aren't that bad Artrose. Commercial jobs are designed by PE'S and balanced by certified TAB. Not to say some shoddy work doesn't get by because it does but not on a large scale. If I...

Now that is a position I can buy R600a. In spite of some of the advice you have got on this thread if you get into duct leak testing do it per SMACNA. For residences you will need a blower the size...

If you need 0.8 inches of static in a residence R600a you do have serious problems. The first being your ducts are undersized. When you commission a house isn't the ductwork already insulated? If so...

The big question then R600a is do you have the proper test equipment and the know how to properly test the ducts? Do you know at what pressure to test at and how much leakage is allowed under each...

I'm sure your experience is more valuable than mine hearthman. I only did certified TAB including duct leak tests for 25 years. If someone installed ductwork for me as you have described they would...

Your questions are owner directed. I would ask the technicians a lot more questions than the owners. Owners mainly fear cost and reliability.

SMACNA has done extensive testing of duct leakage and wrote the book on when testing is needed. If you want to know when, where and how to test ducts for leakage get a copy of their publication "HVAC...

The purpose of the blower door test JB is to quantify the amount of leakage as well as to locate the spots. I have not only been associated with blower door tests but have built 4 houses and...

Have any of you ran a negative blower door test then followed with a positive test at the same pressure and compared the two?

Get ahold of heatingman he lives in Chicago and can solve the problem.

I can't think of anything to say but WHOOOOOOOOOWWWWWWWWWWWWWWWW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

It's starting to sound like the your makeup water control is putting too much water in the basin. With the system running how high is the water level in the basin?

Unfortunately when working as a design engineer I was charged with checking every design job that the division I was did for about 2 years. Telling other engineers they are wrong makes you a lot of...

I was about to say it looks like you stayed because you enjoy the work.

Would you have went back to your previous line of work if not disabled or do you prefer the office now?

It took me 5 years heatingman to adjust to working in an office.

Was it the challenge that kept you in the trade?

I'm beginning to think the challenge of this industry is what attracts talented people that are bored with the humdrum of everyday reading, writing and simple math. Does that sound on target?
...

GenesisRefrig you or nobody else should worry about your story being too long. All experiences here are interesting to me and I read every word and enjoy every word. This is my favorite thread not...

My shot at the guitar is past because of arthritis in my hands but like you seeing other people play tells me I only have an excuse to no longer try. My dad left me his Gibson auditorium guitar he...

My dad had perfect pitch and so does my younger brother. I wanted to play the guitar so got one and learned a few cords. It soon became apparent I did not have perfect pitch or any pitch at all. My...

Ted it's starting to look like your alligator mouth is about to overload your hummingbird ass.

I'm glad you're doing well Ted and that is not meant to be sarcastic. The trade seen as shysters around here are the TAB companies. You ask for opinions and got them so do yourself a favor and...

Tedkidd I can help you with the duct leak part of what you do but a few questions need answered. If you want to sell duct leak tests in residential you should justify the cost. SMACNA has done...

I can't act like a professional K I'm retired beside that I'm not pissed. Just having a little fun with you but I'm truly not upset in the least.

I think on the over all tedkidd the guys have given you some good advice so be a little nicer.

The problem I have had with renewable energy is you can push technology but you can't force it. Some day the world will have to have vast quantities of renewable energy and we should work in that...

Energy saving methods that peter out after subsidies end are not worth doing to start with. Simple payback is a misleading way to evaluate payback but is used all too often. Life cycle cost analyses...

szw21 he is trying to sell his expertise.

You came to the right place for advice Tedkidd. These guys here know their S*** and are willing to help you every step of the way. I haven't seen professional jealousy here which to me is surprising....

My suggestion is to break down the presentation into identifiable segments. The viewer can select the subject they want and you will get more feed back. Remember just because you think you have...

It's good you calculate leakage at normalized pressure otherwise you would over size the equipment considerably. What I don't like about running blower tests at negative pressure is it gives you a...

You are more on target Scooby than you might think. System effect can take place anywhere in the duct system but most problems of consequences are at the fan inlet and outlet. Some duct...

If you run a blower door test at -o.3 w.g. Ted how do you determine structure leakage in order to size equipment from the result?

As long as you can get the needed airflow it doesn't matter what fan you use. You also have to measure the flow. The purpose of the two blowers is so you can select the size blower you need for the...