WiTackleGuy Posted May 11, 2011 Report Share Posted May 11, 2011 Just finished my setup for pouring lead indoors. The fan pulls 160 cfm on high. Should be enough to get the vapors out of the house. Now I can pour year-round. A big plus here in the frozen tundra. My only gripe was that the range hood didn't put out enough light. I could have gone to a fancier model with 2 bulbs instead of one, but a couple clip lights do the job nicely. Quote Link to comment Share on other sites More sharing options...
Painter1 Posted May 11, 2011 Report Share Posted May 11, 2011 Looks good. I may copy that idea! Quote Link to comment Share on other sites More sharing options...
powerworm Posted May 11, 2011 Report Share Posted May 11, 2011 as a rule you need 100 cfm per square foot of the dimensions of your hood. if it is 24" by 30" would equal to a minimum of 500 cfm to do an adequate job. i believe you are going to be underpowered. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted May 11, 2011 Report Share Posted May 11, 2011 Light some paper under it and create some smoke, so you can see what is happening. Dave Quote Link to comment Share on other sites More sharing options...
bakgat Posted May 16, 2011 Report Share Posted May 16, 2011 This is a great idea and it looks great. Thanks for the technical info Powerworm, I think I might also copy this idea at some stage in the future. Quote Link to comment Share on other sites More sharing options...
powerworm Posted May 16, 2011 Report Share Posted May 16, 2011 also the straighter you can keep your exhaust hose the stronger it will pull. the set up shown here is seriously underpowered to remove any fumes from plastic let alone lead which its particulates are much heavier than plastic. if he had moved the exhaust fan over closer to the hole in the wall it would help but anything under 500 cfm is a headache waiting to happen from the fumes even if you see teh majority going up the fan its the ones you dont see that will hurt you Quote Link to comment Share on other sites More sharing options...
WiTackleGuy Posted May 16, 2011 Author Report Share Posted May 16, 2011 (edited) also the straighter you can keep your exhaust hose the stronger it will pull. the set up shown here is seriously underpowered to remove any fumes from plastic let alone lead which its particulates are much heavier than plastic. if he had moved the exhaust fan over closer to the hole in the wall it would help but anything under 500 cfm is a headache waiting to happen from the fumes even if you see teh majority going up the fan its the ones you dont see that will hurt you Straighter is not a problem. I have the sag in the line because I just hung it for the picture. No. I'm not moving the range hood closer to the "WINDOW" not "hole in the wall" as I want some sort of separation and a little angle to act as a moisture trap to keep from having any outside moisture find its way down the exhaust. Your calculations for required cfm puzzle me. I searched online and 500cfm is enough to vent vapors from a mid-size kitchen provided the source of the fumes is on the other side of the room from the vent. It's not a requirement to change the air in the entire room every few minutes. The source of the fumes is directly under the fan. The vapors will not have a chance to infiltrate the rest of the room as there is constant upward airflow. Furthermore while it is true that lead particles are heavier than plastic particles, you might want to be aware of a couple things. Melting lead does vaporize to a gaseous state, but nowhere near the temperatures that we normally cast at. So there is no particle vaporization taking place. Second any particles that do occur generally are a result of the lead being handled in its solid state not the liquid or gas state. These particles are heavy enough that even a much more powerful fan will not vent them away. That is why it is advised to physically sweep the area and clean with a detergent. Pouring outside doesn't eliminate these particles either. It doesn't matter how much ventilation is used. Where some of the danger does lie is in some of the trace elements that occur in most alloys of lead. Some of these can gas off completely when heated. Most of these are quite toxic. However since they are soluble in air, a good airflow over the immediate area (or strong enough to vent smoke sideways from an extinguished candle, if you've done your reading) is enough to carry them away. Plus proper fluxing mitigates the effect of these elements as well. Edited May 16, 2011 by WiTackleGuy Quote Link to comment Share on other sites More sharing options...
powerworm Posted May 16, 2011 Report Share Posted May 16, 2011 500 cfm is only good for a hood that would measure 24"x30" like most typical household rangehoods. the measurements to provide adequate air movement to keep ANY smell or untraceable elements away is going to be higher. think of it like this...you are cooking on your stove in the kitchen under your rangehood with it on high which will be somewhere in the 150-200 cfm ballpark and someone walks in and smells what you are cooking. if it was doing an excellent job of removing all odors, smells and elements there of they you and them wouldnt be able to smell anything as it would be correctly evacuated outside??? Quote Link to comment Share on other sites More sharing options...
Da big tuna Posted January 1, 2012 Report Share Posted January 1, 2012 So I took the Idea you had and then tool man Timmed a Super fan in the exhaust hood . Mine is also on legs instead of hung. Go to a window directly above table. This baby can suck start a Harley. As soon as I open the microwave its pulling all the smoke. Cannot smell a thing but it doesn't have a lot of chance to escape. If you do this you need to plug the vent holes in the front of fan. I cant believe a standard hood fan can pull enough clear the fumes. Do you still need to wear a mask? Quote Link to comment Share on other sites More sharing options...
sdsaw Posted January 1, 2012 Report Share Posted January 1, 2012 This wire baits... What can a microwave be used for here? Quote Link to comment Share on other sites More sharing options...
Da big tuna Posted January 1, 2012 Report Share Posted January 1, 2012 A man can pour without a samwich Quote Link to comment Share on other sites More sharing options...
