why use fans with drying process?

It's just for air circulation in the drying space. It keeps moist stagnant air from sticking in the buds and molding. Never point the fans directly at the buds, just have them in the space to keep moving air around.

I use the first day as a drying day at this time i will run a fan but it’s important not to let fans blow directly on the plant or it will dry to fast, you just want to circulate the air . From then on the fans go off and i just make sure to keep my humidity around 45 % this starts the cure. You want a slow dry to get that smell and taste too full potential and to keep the bud nice and dense

Its for air flow and circulation you want to really concentrate on keeping temp around 15 and humidity to 50-60 % rhm dry tiĺ leaves feel a bit crispy, like 5-9 days. sweat it in a bag for a day then lay out on a screen. Then bottle it for curing after a few days. Grow diaries has a great recent article on this.

The most important thing in drying is humidity. If you have a tent or an uncontrolled drying room, you need to adapt to many external parameters. If it's a rainy day, you'll have an increase in humidity, so there's a likely formation of mold. This is where the fan comes into play; by circulating the air, it prevents moisture buildup inside the buds. However, the fan should never be pointed directly at the buds, as it could dry them out unevenly, leaving them drier where the air hits. If the room is large enough and the humidity is around 50%, fans are not necessary. If you have a semi-controlled box, just set an extractor to the minimum. If the humidity rises above 65%, it starts to become dangerous. If it's 50/60%, you'll have excellent drying. If it drops below 45%, you'll have drying that's too fast, and it could end up tasting like straw.

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It creates airflow which evens out the dry throughout the plant. If you aim the fan directly at the plant and it's too strong, you will dry the plant too quickly which will destroy terpenes and make the plant smell like hay. A proper dry should take about 2 weeks, then it's ready for curing in jars/bags. It's better to hang the whole plant somewhere with low humidity (40-50% - e.g. your grow tent) and have a fan in the room pointing away from the plants to ensure a good airflow and slow dry at around 18-21°C. The same fan you used during the grow cycle will do the job on it's lowest setting, another reason why your grow tent is a good option for drying! Good luck!

if you just sepnd months with a 300, 400 or 600w or more light on, a 25w fan running for a couple weeks is a very small proportion of total cost.

fans speed up the process, but they shouldn't be directly facting the buds so it won't impact drying too much... it moves air around to even hour RH%... if you have drying buds in a room with stagnant air, the RH around the buds is much higher than the overall room's RH. in a small enough room this may be an issue or with enough weed piled up etc...

also is it worth it? i imagine it would cost a little too much having fans 24/7 for a couple weeks if not really worth it