After a customer service mess with local appliance store, got this online through big box home improvement company.  Plenty of room inside.  Slight gap in height (compared to pre-existing opening) filled in by my husband using materials in our garage! Once I learned how to work the control panel, this oven has worked great.  Love the remote control features that I can operate from my phone.  Have used the proofing feature to bake bread during corona virus  isolation.  Heats up fast enough, cools down slowly.