HV Battery Fan, Add Filter?

Been reading about cleaning the HV battery fan. The air inlet is next to the passenger rear seat. I wonder why there is no filter behind the air inlet that would be easily cleaned/replaced. This would keep the fan from getting clogged. The cleaning procedure requires quite a bit of disassembly to get to the fan. Anyone consider adding a filter to the air inlet? Depending upon filter air restriction, it could restrict air flow. Not sure how much air flow is needed.