Why is my filter leaking smell

Another option is adding another filter.
They make inline filters.

So you'd have Filter>Fan>duct>InlineFilter>ExitVent

I think Can make them.
Obviously , like any fliter, it reduces airflow so you'd need the leg room on your fan to account for that.

itsaliveterps said:

I don't have a choice 5% of smell is leaking outside from the vent I can't get a new carbon filter until another 2 weeks I can't afford to lose my project especially now but of course I don't want my bud to smell like ona gel... :/

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If you can't afford to buy another carbon filter at the moment then just keep your windows closed in your house. That will help prevent the smell from leaking out. And put your ona gel in the room next to your grow

Fish scale said:

If you can't afford to buy another carbon filter at the moment then just keep your windows closed in your house. That will help prevent the smell from leaking out. And put your ona gel in the room next to your grow

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Its a wall vent that goes outside

itsaliveterps said:

Its a wall vent that goes outside

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It should be fine, as long as it's not too close to your tent. But if you are worried about smell leaking out of your tent you need to make sure your whole house is sealed to prevent any smell from leaking outside.

If in doubt replace it. How many grows did you do with it? Did you wash the prefilter?, and yes it supposed to be on! A few tips from experience…..One I dont run carbon filters more than 2 grows, they lose maximum effectiveness by then. After that I will use them only for the minor smell of vegging and swap to a new one for those crucial weeks of flowering stinkiness. Also AC Infinity sells carbon filters, where you can replace the carbon with fresh carbon. Same as a new one, and cheaper in the long run. Also I find carbon filters 95- 98% effective, NEVER 100% but better than anything else! For that remaining 2-3% smell of sweetness, Id suggest Ona Gel placed away from grow, a good plug in, and a nice air purifier machine helps too. Cheers.