Hi all new to this so bear with me. Been window cleaning for almost a year and starting to get a lot of gutter cleaning jobs. Was thinking of buying gutter vac to speed up process. Does anyone have any advice on best one to go for. Have looked at polar vak which seems to have very good airflow rate which I'm told is important. Airflow on some of the higher priced vacs is a lot less. Also is there any issue with running 240v on a generator as most genies have 240v connection.