Not sure how many times you should do it but I know that C02 is denser then air so it falls. Putting the hose over the plants and letting it fall is a good idea. No need to use a fan if you have trouble messing with the hose lines. just a note
JeffersonBud Reviewed by JeffersonBud on . CO2 BOOST ADVICE Hey everyone: Got one of those CO2 boost units on Friday and it was easy enough to set up. So here's my question open for discussion..... My garden I can usually run at a comfortable 79-81 degress with proper ventilation - humidity about 42% and everything is going great (touch wood) on flower day 21. Problem is the CO2 boost says for optimal use to make sure the room is sealed, which as everyone knows itn't really practical. I called the company that makes the unit and they said Rating: 5