Delete rows with specific value in multiple Columns

I found the following code on online:

"Delete rows with specific value in Column A and on same row specific value in column B "

   Sub Delete_rows_based_on_ColA_ColB()
      Application.ScreenUpdating = False
      Application.Calculation = xlCalculationManual
      Dim cell As Range, rng As Range, i As Long
      Set rng = Columns("A").SpecialCells(xlConstants, xlTextValues)
      For i = rng.Count To 1 Step -1
         If LCase(rng(i).Value) = "standard" _
              And LCase(rng(i).Offset(0, 1).Value) = "card" _
                Then rng(i).EntireRow.Delete
      Next i
      Application.Calculation = xlCalculationAutomatic
      Application.ScreenUpdating = True
    End Sub

I need help recoding it (if possible) so that it looks at all rows and if Column F, G, & H are <=0 then the row gets deleted, but all three columns (F, G, & H) MUST be <=0

As a side request, I cant figure out in the original code where you would enter the "specific value" to look for in A & B.