# COMMUNITY

### How much cfm psi in a can of propellant?

I want to sandblast/etch an image onto acrylic. so i was wondering how close do the specs of canned air get to an actual sandblaster. Ive searched and couldnt find this anywhere. How much cfm and psi is there in a can of propellant. Can anyone help me with this?

Posted by bsmith102 5 years ago | last reply 5 years ago

### Question Regarding Measurement of Vacuum Pump Air Flow Using Anemometer

Hello everyone, I am new to Instructables and am loving it so far. I was reading through some literature on a piece of equipment we have at work and it requires 18"Hg @ 25CFM. We have flow gauges at work, so it is just a matter of using one to determine the flow but it got me thinking... What is the most effective method of measuring airflow of a vacuum pump without a flow gauge. All I have is an anemometer, a basic understanding of physics and time. So I came up with this method and am looking for some folks to poke holes in it: I placed the anemometer at the end of a 36" piece of PVC with a 1.6" I.D. sealing the anemometer to the PVC to ensure no air gets pulled around the fan of the anemometer. The other end of the pipe is reduced to a 1/4" line (.16" I.D.) which is connected to the vacuum pump. Turning on the vacuum pump yields a steady 3.5MPH (307.98 ft/m)on the anemometer. Doing the math, I come up with 4.3CFM (307.98ft/m*.013962634ft^2).  Unfortunately, I cannot bring a gauge home from work to compare and I cannot bring my set up, as glorious as it may be. So this is more a thinking exercise. So what sort of accuracy would you guys think this 'rig' has? Can you think of some method for me to verify it's accuracy (or, more likely, lack thereof)?

Posted by mmcdonald6 8 years ago | last reply 8 years ago

### I'm looking for a high volume, small size air compressor but I can't find a good one. What do you guys recommend? Answered

I need an air compressor that has an EXTREMELY high CFM (Cubic Feet per Minute) rating. It is for an air-powered exoskeleton (crazy idea, I know). It needs to be pretty small, backpack sized if possible, It doesn't need that big of an air chamber (fire-extinguisher sized). Continuous run is a must. Powering it shouldn't be a problem because I will be carrying ~ 30 pounds of Li-ion batteries for running the compressor. I also won't be needing more then ~ 100PSI. Weight is an almost non issue, I wouldn't mind a 20 pound compressor, I'll probably remove the frame anyway, so that will take away some weight.

Asked by bowmaster 8 years ago | last reply 8 years ago

### What does osi stand for? Answered

As in, "a 16 osi blower delivers 400 cfm of air through a piping system..." I know that cfm is a way of writing cubic feet per minute. PSI is pounds per square inch. Building systems to move gases and liquids around safely has really had me stumped till now, especially when dealing with HVAC. I'm not familiar with some of these units.

Asked by Vorenus 7 years ago | last reply 7 years ago

### What will multiple vacuum pumps do to a vacuum system, namely to PSI?

Long story short, I'm looking to make a vacuum forming table, and have most of the thing designed. However, I am looking to use two (maybe three) cheap vacuum pumps until I have the money to get a decent vacuum pump. I know that the pumps (4 CFM) if stuck in parallel will get me roughly 8 CFM, however, what will that do to the PSI? The pumps have a 90 PSI pull (if thats the right phasing to it) and I'm unsure what grade of pip/tubing to get for this. Thanks in advance!!

Asked by DoctorWoo 5 years ago | last reply 5 years ago

### How do I go about making a Lutron 120vac 60hz household dimmer light switch capable to use for 12vdc??

I want to use this switch for examle in my car connect by the accessory or cigarette lighter plug and it will run a 12vdc fan motor i can control cfm/speed.

Asked by KrAx 7 years ago | last reply 7 years ago

### need help with converting an rc signal to rs 485 nwbe help plz?

I have a project involving converting a rc signal to a signal the max1318 http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4222/t/al can understand. I know that i would need to use a pic micro controller but idk how to use one or which one to use. Could I please be directed in what purchase to make?

### looking for multi- speed quiet wall mount range hood 900cfm for a home

1. any one know where I can get a good reliable easy to clean multi-speed(min 6) range hood with max throughput 900 cfm? prefer    - under \$900 with good warranty. most of the time use only 100 to 200cfm    - price include any custom, brokerage, if needed to Alberta Canada 2. baffle or other filter  (I'm new to kitchrn hood, want something easy to clean, low maintenance, low operating cost)

Asked by gg89 3 years ago | last reply 3 years ago

### Anyone use a Car air filter for home use?

Hello all~! An Idea just flew in my mind! Has anyone used or thought of using a Car air filter for home use? my primitive plan says a Car filter (My car's looks like a tunnel/Chimney) with a high CFM computer Fan mounted on top. The fan would be driven on 12v Adapter (or 9v for silence and life) and would suck air through the filter. The dust would then stick to the outside surfaces of the filter, which can be brushed off / Vacumed later. Any Pros/ Cons/ Ideas? Jump in! People!

Posted by bhvm 6 years ago | last reply 3 years ago