Why are you trying to switch to butane extraction? If you just aren't happy with your alcohol extraction quality take a look at the tutorial in my signature line at the bottom of the post. It walks through basically how I do my QWISO extracts, and if you follow the process will help you produce an excellent quality extraction. Alcohol extractions can be done WAAAAY SAFER and can create just as clean and delicious of extraction without needing a vacuum pump, or outside workspace.
Butane extraction MUST BE DONE OUTSIDE!
Frankly based on your comments and questions it doesn't seem like you are prepared to do it in an safe effective manner. Butane extactions blow up people that don't do it right and take ALL the safety precations.