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Very nice. These are the reasons I need to take engineering classes.

http://icpindexing.toddsit.com/documents/086477/50811160201.pdf page 30 shows a 120kbtu (10 ton) that could move 2120cfm which is probably close to what you want. Just showing you example of how airflow could very and that the rule of thumb as you now are aware I'm sure is crap. As we...

Here familiarize yourself with one of these. http://icpindexing.toddsit.com/documents/086477/50911400101.pdf Go to page 25 this is a pretty good example of a 15 ton unit, bigger than what you're talking about and it can if installed this way use 3900 cfm. Where as if you use you're rule of...

Stern, Nominal cfm at .1 static for most manufacturers was the equivalent of 400cfm per 12,000 btus. It was in blower performance data, is that the question or did I miss the point?

I meant 500 square feet per ton and increments of 6000btus between tons. (1/2tons) and Rules are thumb are like Maurice said..vulcans and faeries and bullcrap.

I did want to add this, if you're cooling a home or building with basic construction grade materials, and you run a manual J calculation it will come within 400-1000 btu's of 400 square feet per ton. Then the equipment you purchase is only in increments of 6,000btus per ton. I am not saying this...

Mauricestoker, Sorry I realized that was an ignorant response after I posted it. I knew better. I teach a night class at the local tech center and latent heat is probably the most complicated subject to explain to people who just want to service acs or install them. When you get into the...

Waramanga, I want to make sure I see your point (thanks for the response by the way). In the field currently, the things engineers lets say I know one, when he tells me that I should be doing something that's impossible in practical terms, he already knows that it is? Because that has happened...

Guys thanks a ton. Just out of curiousity do any of you mind sharing what your exact responsibilities at work are? I'm just curious

The equipment we install commercial or residential up to 5 tons can have a 10 year parts and labor from the manufacturer cost is an additional 400-500 per unit. On anything commercial 5+tons would be put on contract and becomes very expensive and bidding is a nightmare, plus your awarded...

You guys rock thanks for the info. On the calculus..I've never taken it, I've never even done a calculus equation before (that I'm aware of) is there anything I can try to see if I'm prepared to grasp this kind of thing, anything that might have helped you through your classes when you didn't...

Contractor currently in the field. 90% of maintenance personell don't understand economizers and disable them when they quit functioning, or when they thing they don't want 100 degree air being pulled into the building, OR they use poor filters and the evaporator becomes filthy diminishing...

Secondary question.. This is totally not meant to be offensive, but is it really hard to get a teacher that speaks very clear english? Sorry if this offends but it's a problem just the same.

I would like to introduce myself, I'm 25 years old, I am a Class A Mechanical contractor in Arkansas, and Unlimited in Oklahoma. I am looking to change career paths into Mechanical Engineering (P.E.) and I would like to actually talk with some of you who are professionals in the industry...

Sorry Maurice I had to ad this, Wouldn't you use a humidistat for that in conjunction with a tstat?