While an airlock or blowoff tube may be helpful in primary fermentation, they are not essential. I brew ten gallon batches using the open fermentation method all the time.
If you are using an airlock or blow-off tube during primary fementation then it would make sense to seal the lead.
Perhaps you could seal the fermenter shut and plug up the airlock hole. Then you will get a very nice treatment of eau de beer for your room. Enjoy the aroma for years to come
Just kidding. I usually do a blowoff tube for the first week and then switch to an air lock for the remaining 3 weeks prilary.
I use a blow off for the primary all of the time.
1) Because I have it.
2) Because I would feel an idiot if I had it, needed it and didn't use it.
3) You never really know what kind of fermentation you are going to get.
4) I don't like to feel like an idiot.
Yep...I will use a blow off until the bubbles subside then I will put on an airlock to save space.
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