We are about to have a new Mitsubishi Zuba 3-ton central heat pump installed. We will make use of the existing duct system which has been confirmed to be adequate except for insulation which will be upgraded.
We have 10 registers, 7 of which are ceiling mounted near windows and 3 are wall mounted (one high, two low (attic room)) The registers are all 12x6. Originals have multiple dampers, but several have been replaced with the type that has just one large damper/baffle. I think these may be wall registers? (pics of registers attached)
Partly for cosmetic reasons and partly to improve flow patterns, I feel I should replace some of the registers. In our town, nobody stocks this size, so I will have to buy on-line.
My question relates to the louvre orientation. Apparently I can buy 1,2,3 or 4 way registers. Are there guidelines as to which way should the air flow be directed given that they will be used mainly for heating?
Pics of two typical rooms attached.