“This type is used on short-haul domestic segments and many passengers enjoy the 1-2 layout for comfort and personal space. Onboard storage is limited as there is only overhead storage on the right hand side. Standard rollaboard suitcases will not fit in these compartments and may need to be checked at the aircraft door. From time to time, passengers may be moved for weight and balance considerations. There is also limited under seat storage at all window seats due to the curvature of the fuselage.” — SeatGuru
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SeatGuru claims seats are 17” wide, MC offers 33” pitch and MCE 33”.
Embraer ERJ-145 / ER4 seat chart