Dry Room Dehumidifiers/Air Purifiers

Hey, I’m new to Percy’s so sorry if this has already been talked about before. 

I’ve grown a handful of times (indoor - many years ago) but haven’t yet managed to dry/cure correctly. My buds have always smelt okay but had a definite grassy/dried mint smell and taste and not the smoothest of smokes. Basically I didn’t really know what I was doing and made the obvious rookie mistakes.

I would love to get this part of the grow right this time and so I’ve been reading way too many articles about it, including everything on Percy’s, and now feel like I have a better understanding of how things should work. Great! 
Except, the only place I have to dry the flowers is an airing cupboard which leads me to a few problems I hope you can help me solve 🙏🏼

The aim is to hang whole branches upside-down, in complete darkness, maintaining a good air exchange (without any direct airflow on the flowers), at a temperature of 18-20 degrees Celsius and holding a RH of 50%, for around 7-10 days (up to 14). 

I’m not concerned about temperature as the average highs for the time when I’ll be harvesting are between 15-20 degrees. Anything lower I can quite easily monitor and correct with the central heating. 

The problems I can see are:

• Humidity
• Air Exchange 
• Aroma 

Humidity - the average RH levels where I am are about 65-70% late Sept (which is when I’ll most likely be harvesting). Obviously, adding a load of wet organic material into a smallish space with these kind of RH levels is a problem. 
My initial thoughts are to use a dehumidifier, one that can maintain a constant 50% (maybe increasing to 55% in the latter stages). The one I’m looking at also purifies the air by filtering through an active carbon filter and a HEPA filter for dust and airborne nasties. 

Air Exchange - being an airing cupboard the ventilation isn’t bad but it’s not good enough. There is a wooden panel above the door that I could fit a couple of small, slow intake fans. I’m hoping this should give enough air exchange. 

Aroma - perhaps the biggest issue is the smell. On previous grows I just used the same tent that the buds had bloomed in, but with growing in the garden this year I don’t have that as an option. Not sure if this is a good idea, but I’m considering adding another small air purifier with carbon filtration. My thinking is that with the dehumidifier and air purifier both carbon filtering the air in what is a smallish space then I might not get too much smell. Could I maybe even seal the door shut with tape so that the only air flow is through the fans which will only be pumping out filtered air. 

A lot of hypotheticals I know, but I would like to get it all planned in advance to give myself the best chance of getting it right. Please let me know what’s good/bad about my plan and anything else I haven’t thought about. 

Thanks! 🙏🏼 

* I’ll be using a wireless temperature/humidity logger which records data over time to monitor levels before and during the cure.