C02 AND TIMER PROBLEMS

Hi people, I am just getting started using Co2. The problem I have is how to program my timers to fit the schedule for how much Co2 I need. I need 2.6 cu ft/hr. 15 min in total. So, I figured I would shut off the timers to my incoming fresh air fan, and filter fan from 10-15 past the hour, 30 min-35 past the hour, and 50-55min past the hour. I am using Titan Apollo 9 timers. I cant seem to get them programmed to do that. Any suggestions. I have this schedule to spread the rate out evenly over a one hour period. I am currently on 18/6 schedule. Thanks in advance.

I connect mine with my light timer so it's only on with the lights. The. I turn the output down to where the ball doesn't move and in my grow that's enough to give me 12-1400 ppm

Also the pros say co2 during veg is a waste. I agree

Thanks